linux/fs/ceph/snap.c
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   1#include <linux/ceph/ceph_debug.h>
   2
   3#include <linux/sort.h>
   4#include <linux/slab.h>
   5
   6#include "super.h"
   7#include "mds_client.h"
   8
   9#include <linux/ceph/decode.h>
  10
  11/*
  12 * Snapshots in ceph are driven in large part by cooperation from the
  13 * client.  In contrast to local file systems or file servers that
  14 * implement snapshots at a single point in the system, ceph's
  15 * distributed access to storage requires clients to help decide
  16 * whether a write logically occurs before or after a recently created
  17 * snapshot.
  18 *
  19 * This provides a perfect instantanous client-wide snapshot.  Between
  20 * clients, however, snapshots may appear to be applied at slightly
  21 * different points in time, depending on delays in delivering the
  22 * snapshot notification.
  23 *
  24 * Snapshots are _not_ file system-wide.  Instead, each snapshot
  25 * applies to the subdirectory nested beneath some directory.  This
  26 * effectively divides the hierarchy into multiple "realms," where all
  27 * of the files contained by each realm share the same set of
  28 * snapshots.  An individual realm's snap set contains snapshots
  29 * explicitly created on that realm, as well as any snaps in its
  30 * parent's snap set _after_ the point at which the parent became it's
  31 * parent (due to, say, a rename).  Similarly, snaps from prior parents
  32 * during the time intervals during which they were the parent are included.
  33 *
  34 * The client is spared most of this detail, fortunately... it must only
  35 * maintains a hierarchy of realms reflecting the current parent/child
  36 * realm relationship, and for each realm has an explicit list of snaps
  37 * inherited from prior parents.
  38 *
  39 * A snap_realm struct is maintained for realms containing every inode
  40 * with an open cap in the system.  (The needed snap realm information is
  41 * provided by the MDS whenever a cap is issued, i.e., on open.)  A 'seq'
  42 * version number is used to ensure that as realm parameters change (new
  43 * snapshot, new parent, etc.) the client's id="L5" class="line" name="L5">   5
<"> * snapshot, nesvcvalue="v2on is
 * mai4tains a hierarchy of re4lms r4flecting the current parent/chp.c#ue="v2on is
 * rea4m relationship, and for4each 4ealm has an explicit list of snaps<,h/snap.s/spays="lin>
  26 * inh4rited from prior parent4.
  38 *
  38 * A s4ap_realm struct is main4ained4for realms containing everye="L12">  12 * wit5 an open cap in the sys5em.  5The needed snap realm informatUnid="L35" cl errephinedlss=""/ce b"linix="fe" n="L2f3"  g  12 * pro5ided by the MDS wheneve5 a ca5 is issued, i.e., on open.)  A  12 * ver5ion number is used to e5sure 5hat as realm parameters changee" name=s="llm " idw.c#L"  cavalu about "li(besspan>eteplclass="  12 * sna5shot, new parent, etc.)5the c5 systems or file servers that  12  38   6#include " * rea5m relationship, and for5each 56   6#include " * inh5rited from prior parent5.
  12 *
  12 * A s5ap_realm struct is main5ained5for realms containing every i"L12">  12 * wit6 an open cap in the sys6em.  6pear to be applied at slightly  12 * pro6ided by the MDS wheneve6 a ca6 is issued, i.e., on open.)  /"L38">  38 * ver6ion number is used to e6sure 6hat avoidax_prefs();" na=line"g
* sna6shot, new parent, etc.)6the c6 syst href="x_prefs();" na=line"e
8g 2 na7;d\na>"L38"> , "_prefs();" na=an>
each 66syst "_prefs();" na=atomic_ue=ddiv id="fi="L10atomic_ue=dat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a), "_prefs();" na=atomic_ue=ddiv id="fi="L10atomic_ue=dat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)+1) 10 * inh6rited from prior parent6. 12 * 12 * A s6ap_realm struct is main6ained6for realms containing every hhhhhhhh*s="linion ie 26 * wit7 an open cap in the sys7em. 7pear to be applied at slighthhhhhhhh*snafn="L" lu L41"" 26 * pro7ided by the MDS wheneve7 a ca7 is issued, i.e., on open.) hhhhhhhh*saddi> 12 * ver7ion number is used to e7sure 7hat as realm parameters chanhhhhhhhh*/"L38"> 38 * sna7shot, new parent, etc.)7the c7 syst if ("_prefs();" na=atomic_ue=ddiv id="fi="L10atomic_ue=dat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a) == 0) { 38 "_prefs();" na=e#include "
"_prefs();" na=empt#_a h
#include " "_prefs();" na=e#include " * * A s7ap_realm struct is main7ained79syst "_prefs();" na=atomic_ne"div id="fi="L10atomic_ne"at a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)8 * wit8 an open cap in the sys8em. 8pear }#include " * pro8ided by the MDS wheneve8 a ca81 9#include < * ver8ion number is used to e8sure 8hat a="lxr_ voidax_prefs();" na=__neserp_e
* sna8shot, new parent, etc.)8the c8 syst href="x_prefs();" na=line"e
"_prefs();" na=rb_ame=div id="fi="L10rb_ame="L a8 div id="fi="L10p5"L a = "_prefs();" na=NULLdiv id="fi="L10NULL"L a8
9#include < * A s8ap_realm struct is main8ained89syst wh/sna(i"_prefs();" na=pdiv id="fi="L10p"L a) { 38 * wit9 an open cap in the sys9em. 90syst "_prefs();" na=p5div id="fi="L10p5"L a = i"_prefs();" na=pdiv id="fi="L10p"L a8 * pro9ided by the MDS wheneve9 a ca91syst "_prefs();" na=adiv id="fi="L10r"L a = "_prefs();" na=rb_/a>rydiv id="fi="L10rb_/a>ryat a(s_prefs();" na=p5div id="fi="L10p5"L a, href="x_prefs();" na=line"e
* ver9ion number is used to e9sure 92syst if ("_prefs();" na=new1iv id="fi="L10ne="L a-0"> "_prefs();" na=ino1iv id="fi="L10inosyst h/de "_prefs();" na=adiv id="fi="L10r"L a-0"> "_prefs();" na=ino1iv id="fi="L10inosyst) 38 * sna9shot, new parent, etc.)9the c9 syst "_prefs();" na=pdiv id="fi="L10p"L a = &(i"_prefs();" na=pdiv id="fi="L10p"L a)-0"> "_prefs();" na=rb_leftdiv id="fi="L10rb_left"L a8 "_prefs();" na=ino1iv id="fi="L10inosyst hgde "_prefs();" na=adiv id="fi="L10r"L a-0"> "_prefs();" na=ino1iv id="fi="L10inosyst) 38 "_prefs();" na=rb_h"> div id="fi="L10rb_r"> "L a8 #include "#include < "_prefs();" na=ame=div id="fi="L10ame="L a, "_prefs();" na=p5div id="fi="L10p5"L a, "_prefs();" na=pdiv id="fi="L10p"L a) 10 /* "_prefs();" na=ame=div id="fi="L10ame="L a, "_prefs();" na=aootdiv id="fi="L10rootat a) 10 * Snap0shots in ceph are driven02m. na2ear }#include " * clie0nt. In contrast to loca03m. na3 9#include < * impl0ement snapshots at a sin04m. nadetail, fortunately... it me="L12"> 12 * dist0ributed access to storag05m. naflecting the current parent/chf="fs/="fs/g 18 * whet0her a write logically oc06m. naealm has an explicit list of "L18"> 18 * snap0shot. 12 * 38 * This0 provides a perfect inst09m. na9at a="lxr_ href="x_prefs();" na=line"e
/* * Snappshots in ceph are drivenn in 1arge p{ 38 * clieent. In contrast to locaal fi113syst href="x_prefs();" na=line"e
* impllement snapshots at a sinngle 1oint i 10 * disttributed access to storagge re115syst "_prefs();" na=an>
* whetther a write logically occcurs116syst if (!"_prefs();" na=an>
* snappshot. * * Thiss provides a perfect insttanta119syst "_prefs();" na=atomic_seadiv id="fi="L10atomic_seaat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a, 0); ", fortunately... it me= tre lue=s="lltake"fs/cfe=/"L38"> 38 * cli1ents, however, snapshots1 may 12esyst "_prefs();" na=rn>
"_prefs();" na=ino1iv id="fi="L10inosyst = "_prefs();" na=ino1iv id="fi="L10inosyst 10 * dif1ferent points in time, d1epend121syst "_prefs();" na=INIT_LIST_HEAD1iv id="fi="L10INIT_LIST_HEADat a(&"_prefs();" na=an>
"_prefs();" na=name=r v id="fi="L10lame=r at a) 10 * Snapsshots in ceph are driven in 122syst "_prefs();" na=INIT_LIST_HEAD1iv id="fi="L10INIT_LIST_HEADat a(&"_prefs();" na=an>
"_prefs();" na=name=_a h
* cliean>
"_prefs();" na=empt#_a h
#include " * Sna1pshots are _not_ file sy1stem-124syst "_prefs();" na=INIT_LIST_HEAD1iv id="fi="L10INIT_LIST_HEADat a(&"_prefs();" na=an>
"_prefs();" na=dirt#_a h
#include " * distlies to the subdirectory1 nest125syst "_prefs();" na=INIT_LIST_HEAD1iv id="fi="L10INIT_LIST_HEADat a(&"_prefs();" na=an>
"_prefs();" na=name=s_ion _caps1iv id="fi="L10inoe=s_ion _capsat a)7#include " * whetectively divides the hie1rarch126syst "_prefs();" na=spin_lock_lastdiv id="fi="L10spin_lock_lastat a(&"_prefs();" na=an>
"_prefs();" na=name=s_ion _caps_lock1iv id="fi="L10name=s_ion _caps_lockat a)7#include " * snapthe files contained by e1ach r127syst "_prefs();" na=__neserp_e
"_prefs();" na=e
#include " * 8f="fs/"e <2 na7;llx2 na7;p\na>"L38"> , "_prefs();" na=an>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
#include " * Thislicitly created on that 1realm129syst x_looku"_prefs();" na=an>
* par1ent's snap set _afte1r_ th13pear }#include " * par1ent (due to, say, a rena1me). 131 9#include < * dur1ing the time intervals d1uring1which they were the parent ae="L12"> 12 * 12 * The1 client is spared most o1f thi1 detail, fortunately... it mus"L12"> 12 * distntains a hierarchy of re1alms 1eflecting the current parent/ch 12 * rea1lm relationship, and for1 each1realm has an explicit list of /"L38"> 38 * inh1erited from prior parent1s.
* * A s1nap_realm struct is main1taine1 for r{ 38 * wit1h an open cap in the sys1tem. 14esyst href="x_prefs();" na=rb_ame=div id="fi="L10rb_ame="L a i"_prefs();" na= v id="fi="L10nsyst = "_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e * pro1vided by the MDS wheneve1r a c141syst href="x_prefs();" na=line"e
* dur1sion number is used to e1nsure14> 3#include < * sna1pshot, new parent, etc.)1 the 143syst wh/sna("_prefs();" na= v id="fi="L10nsyst) { 38rydiv id="fi="L10rb_/a>ryat a(s_prefs();" na= v id="fi="L10nsyst, href="x_prefs();" na=line"e
* mai14tains a hierarchy of re14lms 145syst if ("_prefs();" na=ino1iv id="fi="L10inosyst h/de "_prefs();" na=adiv id="fi="L10r"L a-0"> "_prefs();" na=ino1iv id="fi="L10inosyst) 38 * rea14m relationship, and for14each146syst "_prefs();" na= v id="fi="L10nsyst = "_prefs();" na= v id="fi="L10nsyst-0"> "_prefs();" na=rb_leftdiv id="fi="L10rb_left"L a8 * inh14rited from prior parent14. "_prefs();" na=ino1iv id="fi="L10inosyst) 38 * "_prefs();" na=rb_h"> div id="fi="L10rb_r"> "L a8 * A s14ap_realm struct is main14aine149syst else { 38 * wit15 an open cap in the sys15em. 150syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8"> <2 na7;llx2 na7;p\na>"L38"> , "_prefs();" na=adiv id="fi="L10r"L a-0"> "_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=adiv id="fi="L10r"L a)8 * pro15ided by the MDS wheneve15 a c151syst x_looku"_prefs();" na=adiv id="fi="L10r"L a 10 * ver15ion number is used to e15sure152syst }#include " * sna15shot, new parent, etc.)15the 153syst }#include " 6}#include " * rea15m relationship, and for15each156 6#include " * inh15rited from prior parent15.
*
* A s15ap_realm struct is main15aine159 9#include < * wit16 an open cap in the sys16em. 16pear to be applied at slighe="L12"> 12 * pro16ided by the MDS wheneve16 a c16 is issued, i.e., on open.) h 12 * ver16ion number is used to e16sure16hat as realm parameters chang/"L38"> 38 * sna16shot, new parent, etc.)16the 16 syst hlxr_ voidax_prefs();" na=__de hroy_e
each166syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8__de hroy_e <2 na7;p2 na7;llx\na>"L38"> , "_prefs();" na=an>
"_prefs();" na=ino1iv id="fi="L10inosyst)8 * inh16rited from prior parent16. *
"_prefs();" na=ame=div id="fi="L10ame="L a, &"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e * A s16ap_realm struct is main16aine169 9#include < * wit17 an open cap in the sys17em. 170syst if ("_prefs();" na=an>
"_prefs();" na=p5div id="fi="L10p5"L a) { 38 * pro17ided by the MDS wheneve17 a c171syst "_prefs();" na=="li_del_lastdiv id="fi="L10="li_del_lastat a(&"_prefs();" na=an>
"_prefs();" na=name=_a h
* ver17ion number is used to e17sure172syst x_prefs();" na=__pup_e
"_prefs();" na=p5div id="fi="L10p5"L a) 10 * sna17shot, new parent, etc.)17the 173syst }#include "
"_prefs();" na=p="li_p5_e
"_prefs();" na=e * snapsshot.
"_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) 10 *
* A s17ap_realm struct is main17aine179syst}#include " * wit18 an open cap in the sys18em. 1811"> 11 * pro18ided by the MDS wheneve18 a c18" id="L12" class="line" name="L12"> 12 * ver18ion number is used to e18sure18hat as realm parameters change 12 * sna18shot, new parent, etc.)18the 18" id="L34" class="line" name=/"L38"> 38
8__pup_e <2 na7;llx2 na7;p2 na7;d -0"> 2 na7;d\na>"L38"> , "_prefs();" na=an>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
*
"_prefs();" na=n="L1iv id="fi="L10n="Lat a), "_prefs();" na=atomic_ue=ddiv id="fi="L10atomic_ue=dat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)-1) 10 * A s18ap_realm struct is main18aine189syst if ("_prefs();" na=atomic_dec_and_tesadiv id="fi="L10atomic_dec_and_tesaat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)) 38 * wit19 an open cap in the sys19em. 190syst "_prefs();" na=__de hroy_e
* pro19ided by the MDS wheneve19 a c191syst}#include " * ver19ion number is used to e19sure19> 3#include < * sna19shot, new parent, etc.)19the 19" id="L34" class="line" name="L12"> 12 15 38
8pup_e <2 na7;llx2 na7;p2 na7;d -0"> 2 na7;d\na>"L38"> , "_prefs();" na=an>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a), "_prefs();" na=atomic_ue=ddiv id="fi="L10atomic_ue=dat a(&"_prefs();" na=an>
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)-1) 10 /*
"_prefs();" na=n="L1iv id="fi="L10n="Lat a)) 38 * Sna20shots in ceph are drive202m. 202syst x_look 10 *#include < * imp20ement snapshots at a si204m. 204syst if ("_prefs();" na=down_ "_prefs();" na=e * dis20ributed access to stora205m. 205syst "_prefs();" na=__de hroy_e
* whe20her a write logically o206m. 206syst "_prefs();" na=up_ "_prefs();" na=e * of t0shot. * "_prefs();" na=e#include " * Thi20 provides a perfect ins209m. 209syst "_prefs();" na=="li_adddiv id="fi="L10="li_addat a(&"_prefs();" na=an>
"_prefs();" na=empt#_a h
"_prefs();" na=e#include " "_prefs();" na=e#include "/* * Sna2pshots in ceph are drive2n in 212ear }#include " * cli2ent. In contrast to loc2al fi213 9#include < * imp2lement snapshots at a si2ngle 21detail, fortunately... it me="L12"> 12 * dis2tributed access to stora2ge re21flecting the current parent/chCle thupdass=" id=" whosc#uef 12 * whe2ther a write logically o2ccurs21ealm has an explicit list of sp.c#L/snap.ue=s="llne" nam=" id=" who3" id=c="fs/d but ="llyei"L26"> 26 * sna2pshot. 12 * 39 * Thi2s provides a perfect ins2tanta21for realms containing every inCall dnunderie 12 * cli2ents, however, snapshots2 may 22pear to be applied at slightl/"L38"> 38 * dif2ferent points in time, d2epend221syst hlxr_ voidax_prefs();" na=__m " nuspempt#_" id="div id="fi="L10__m " nuspempt#_" id="at a( href="x_prefs();" na=line"="line" nadiv id="fi="L10line"="line" naat a i"_prefs();" na=="lcdiv id="fi="L10="lcat a) 38 * Sna2sshots in ceph are drive2 in 22rge p{ 38 * cli2an>
* Sna2pshots are _not_ file sy2stem-22int i 10 * dis2lies to the subdirectory2 nest225syst "_prefs();" na=epin_lock1iv id="fi="L10spin_lockat a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e#include " * whe2ectively divides the hie2rarch226syst wh/sna(!"_prefs();" na=="li_empt#1iv id="fi="L10="li_empt#at a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e * sna2the files contained by e2ach r227syst "_prefs();" na=an>
rydiv id="fi="L10="li_firli_ea>ryat a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e *
#include " * Thi2licitly created on that 2realm229syst "_prefs();" na=="li_deldiv id="fi="L10="li_delat a(&"_prefs();" na=an>
"_prefs();" na=empt#_a h
#include " * par2ent's snap set _afte2r_ th230syst "_prefs();" na=spin_unlock1iv id="fi="L10spin_unlockat a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e#include " * par2ent (due to, say, a rena2me). 231syst "_prefs();" na=__de hroy_e
* dur2ing the time intervals d2uring232syst x_prefs();" na=epin_lock1iv id="fi="L10spin_lockat a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e#include " * * The2 client is spared most o2f thi234syst "_prefs();" na=spin_unlock1iv id="fi="L10spin_unlockat a(&"_prefs();" na=="lcdiv id="fi="L10="lcat a-0"> "_prefs();" na=e#include " * dis2ntains a hierarchy of re2alms 23> 6}#include " * rea2lm relationship, and for2 each236 6#include " * inh2erited from prior parent2s. * * A s2nap_realm struct is main2taine239syst "_prefs();" na=down_ "_prefs();" na=e * wit2h an open cap in the sys2tem. 24esyst "_prefs();" na=__m " nuspempt#_" id="div id="fi="L10__m " nuspempt#_" id="at a("_prefs();" na=="lcdiv id="fi="L10="lcat a) 10 * par2vided by the MDS wheneve2r a c241syst "_prefs();" na=up_ "_prefs();" na=e * dur2sion number is used to e2nsure242ear }#include " * sna2pshot, new parent, etc.)2 the 243 9#include < 12 * mai24tains a hierarchy of re24lms 24flecting the current parent/chadje" ht.c#p5#ue="v of a given @ue="v. hadje" hname=3="li,="fs/p5"L12"> 12 * rea24m relationship, and for24each24ealm has an explicit list of spointers,="fs/uef 12 * inh24rited from prior parent24. 12 * #washnaanged, 0 if unnaanged, h/de0 on erro=n"L12"> 12 * A s24ap_realm struct is main24aine24for realms containing every i"L12"> 12 * wit25 an open cap in the sys25em. 25pear to be applied at slightlh 12 * pro25ided by the MDS wheneve25 a c25 is issued, i.e., on open.) /"L38"> 38 * ver25ion number is used to e25sure25hat a="lxr_ int "_prefs();" na=adje" _e <_p5div id="fi="L10adje" _e <_p5at a( href="x_prefs();" na=line"="line" nadiv id="fi="L10line"="line" naat a i"_prefs();" na=="lcdiv id="fi="L10="lcat a, 38 * sna25shot, new parent, etc.)25the 253syst href="x_prefs();" na=line"e
ino1iv id="fi="L10p5inoat a) 38 * rea25m relationship, and for25each256syst href="x_prefs();" na=line"e
div id="fi="L10p5"L a 10 * inh25rited from prior parent25. *
"_prefs();" na=p5_ino1iv id="fi="L10p5_inosyst == "_prefs();" na=p5ino1iv id="fi="L10p5inoat a) 38 * A s25ap_realm struct is main25aine259syst x_looku0 10 * wit26 an open cap in the sys26em. 2611"> 11 * pro26ided by the MDS wheneve26 a c261syst "_prefs();" na=p5div id="fi="L10p5"L a = "_prefs();" na=line"">
ino1iv id="fi="L10p5inoat a) 10 * ver26ion number is used to e26sure262syst if (!"_prefs();" na=p5div id="fi="L10p5"L a) { 38 * sna26shot, new parent, etc.)26the 263syst "_prefs();" na=p5div id="fi="L10p5"L a = "_prefs();" na=line"c="fs/"e
ino1iv id="fi="L10p5inoat a) 10 div id="fi="L10p5"L a)) 38div id="fi="L10p5"L a) 10 * rea2hh/super.h" class="fref"2>each266syst }#include " * inh26rited from prior parent26. 8adje" _e <_p52 na7;llx2 na7;p:2 na7;llx2 na7;p2-0"> 2 na7;llx2 na7;p\na>"L38"> ,#include " *
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
"_prefs();" na=p5_ino1iv id="fi="L10p5_inosyst, "_prefs();" na=an>
"_prefs();" na=p5div id="fi="L10p5"L a,#include " * A s26ap_realm struct is main26aine269syst "_prefs();" na=p5ino1iv id="fi="L10p5inoat a, "_prefs();" na=p5div id="fi="L10p5"L a) 10 * wit27 an open cap in the sys27em. 270syst if ("_prefs();" na=an>
"_prefs();" na=p5div id="fi="L10p5"L a) { 38 * pro27ided by the MDS wheneve27 a c271syst "_prefs();" na=="li_del_lastdiv id="fi="L10="li_del_lastat a(&"_prefs();" na=an>
"_prefs();" na=name=_a h
* ver27ion number is used to e27sure272syst x_prefs();" na=line"pup_e
"_prefs();" na=p5div id="fi="L10p5"L a) 10 * sna27shot, new parent, etc.)27the 273syst }#include "
"_prefs();" na=p5_ino1iv id="fi="L10p5_inosyst = "_prefs();" na=p5ino1iv id="fi="L10p5inoat a 10
"_prefs();" na=p5div id="fi="L10p5"L a = "_prefs();" na=p5div id="fi="L10p5"L a 10
div id="fi="L10p5"L a) 10 * inh2sshot.
"_prefs();" na=name=_a h
div id="fi="L10p5"L a-0"> "_prefs();" na=name=r v id="fi="L10lame=r at a) 10 * * A s27ap_realm struct is main27aine279syst}#include " * wit28 an open cap in the sys28em. 2811"> 11 * pro28ided by the MDS wheneve28 a c281 9#include < * ver28ion number is used to e28sure28hat a="lxr_ int "_prefs();" na=cmpu64panv v id="fi="L10lmpu64panvat a(const voidai"_prefs();" na=adiv id="fi="L10aat a, const voidai"_prefs();" na=bdiv id="fi="L10bat a) 38 * sna28shot, new parent, etc.)28the 28" id={ 38 * inh28h/mds_client.h" class="28. * * A s28ap_realm struct is main28aine289syst}#include " * wit29 an open cap in the sys29em. 2911"> 11 * pro29ided by the MDS wheneve29 a c29" id="L12" class="line" name="L12"> 12 * ver29ion number is used to e29sure29hat as realm parameters changebume=3t.c#="co 792d3xn=cepha given ue="v."L12"> 12 * sna29shot, new parent, etc.)29the 29" id="L34" class="line" nam /"L38"> 38
div id="fi="L10p5"L a = "_prefs();" na=rn>
"_prefs();" na=p5div id="fi="L10p5"L a 10 *
"_prefs();" na=nu<_p="li_p5_e
"_prefs();" na=nu<_e 11/* 12 * Sna30shots in ceph are drive302m. 30hat as realm parameters channnnnnnnngebume=3p52792d3xn, if it hasnesvcvthbeen bumet."L12"> 12 *2e hbe"L12"> 12 12 38 * whe30her a write logically o306m. 306syst if ("_prefs();" na=p5div id="fi="L10p5"L a) { 38 * of 30shot. div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) { 38div id="fi="L10p5"L a) 10 * Thi30 provides a perfect ins309m. 309syst if ("_prefs();" na=eradiv id="fi="L10era"L a) 38 /* * Sna3pshots in ceph are drive3n in 312syst x_prefs();" na=nu
div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=nu<_e * cli3ent. In contrast to loc3al fi313syst }#include " * imp3lement snapshots at a si3ngle 31int i 10 * dis3tributed access to stora3ge re315syst "L12" class="line" name= do i actuallyaL41"" 38 * whe3ther a write logically o3ccurs31ealm has an explicit list offfffffffffmatna=s#ue="v seq,="fs/my p5sesvcvp.ue=sto. (/snapwork="L15"> 15 * sna3pshot. 15 38 * Thi3s provides a perfect ins3tanta319syst if ("_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a && 38 * cli3ents, however, snapshots3 may 320syst "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst == "_prefs();" na=an>
"_prefs();" na=eeqdiv id="fi="L10eeq"Lst && 38/*div id="fi="L10p5"L a || 38 * Sna3sshots in ceph are drive3 in 322syst "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst 0"> = "_prefs();" na=p5div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst)) { 38 * cli3an> 8bume=_e"L38"> 38 * imp3pshots are _not_ file sy3stem-324syst ssued, i.e., n> 8 (unnaanged)\na>"L38"> ,#include " * dis3lies to the subdirectory3 nest325syst "_prefs();" na=an>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
"_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a,#include " * whe3ectively divides the hie3rarch326syst "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst,#include " * sna3the files contained by e3ach r327syst (unsign1""int) "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=nu<_e * * Thi3licitly created on that 3realm329syst }#include " * par3ent's snap set _afte3r_ th3311"> 11 * par3ent (due to, say, a rena3me). 331syst "L12" class="line" name=LallocaL4w#="co 792d3xn=g/"L38"> 38 * dur3ing the time intervals d3uring332syst "_prefs();" na=eradiv id="fi="L10era"L a = -"_prefs();" na=ENOMEMdiv id="fi="L10ENOMEM"L a 10 * * The3 client is spared most o3f thi334syst goto "_prefs();" na=faildiv id="fi="L10fail"L a 10 * dis3ntains a hierarchy of re3alms 335syst "_prefs();" na=e * rea3lm relationship, and for3 each336syst if (!"_prefs();" na=e * sna3erited from prior parent3s. * "_prefs();" na=n="L1iv id="fi="L10n="Lat a, 1) 10 * A s3nap_realm struct is main3taine339 9#include < * wit3h an open cap in the sys3tem. 34esyst "L12" class="line" name=Lbume=3(reverse sorted)#="co vector=g/"L38"> 38 * par3vided by the MDS wheneve3r a c341syst "_prefs();" na=nu
* dur3sion number is used to e3nsure342syst "_prefs();" na=e "_prefs();" na=eeqdiv id="fi="L10eeq"Lst = "_prefs();" na=an>
"_prefs();" na=eeqdiv id="fi="L10eeq"Lst 10 *div id="fi="L10p5"L a) { 38 * dis34tains a hierarchy of re34lms 34flect 10 * rea34m relationship, and for34each346syst "L12" class="line" name=Lne" nam=ass=of p5esvcvs2e 38 * sna34rited from prior parent34. 38 * div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=nu<_e * A s34ap_realm struct is main34aine349syst if ("_prefs();" na=p5div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=e = 10 * wit35 an open cap in the sys35em. 350syst "_prefs();" na=an>
"_prefs();" na=p5_ene"ediv id="fi="L10p5_ene"e"L a) 10 * pro35ided by the MDS wheneve35 a c351syst "_prefs();" na=e "_prefs();" na=e * dur35ion number is used to e35sure352syst "_prefs();" na=p5div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=e * sna35shot, new parent, etc.)35the 353syst if ("_prefs();" na=p5div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst 0"> "_prefs();" na=e "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 10 "_prefs();" na=eeqdiv id="fi="L10eeq"Lst = "_prefs();" na=p5div id="fi="L10p5"L a-0"> "_prefs();" na=csna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst 10 * dis3dd="L6" class="line" nam3elms 355syst }#include " * rea35m relationship, and for35each356syst "_prefs();" na=memcp#1iv id="fi="L10memcp#at a(s_prefs();" na=e "_prefs();" na=e
"_prefs();" na=e#include " * inh35rited from prior parent35.
"_prefs();" na=nu<_e *
"_prefs();" na=nu<_e * A s35ap_realm struct is main35aine359syst "_prefs();" na=memcp#1iv id="fi="L10memcp#at a(s_prefs();" na=e "_prefs();" na=e
"_prefs();" na=p="li_p5_e#include " * wit36 an open cap in the sys36em. 360syst sizeof("_prefs();" na=u6linux/slabi="L10u6detai)i"_prefs();" na=an>
"_prefs();" na=nu<_p="li_p5_e * pro36ided by the MDS wheneve36 a c361syst "_prefs();" na=nu
"_prefs();" na=nu<_p="li_p5_e * dur36ion number is used to e36sure36> 3#include < * sna36shot, new parent, etc.)36the 363syst "_prefs();" na=eorndiv id="fi="L10eornat a(s_prefs();" na=e "_prefs();" na=e "_prefs();" na=nu<_e * dis36d="L6" class="line" nam36lms 365syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8bume=_e"L38"> ,#include " * rea3hh/super.h" class="fref"3>each366syst "_prefs();" na=rn>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
"_prefs();" na=eeqdiv id="fi="L10eeq"Lst,#include " * inh36rited from prior parent36. "_prefs();" na=nu<_e * * A s36ap_realm struct is main36aine369syst if ("_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) 10 * wit37 an open cap in the sys37em. 370syst "_prefs();" na=line"pup_e
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) 10 * pro37ided by the MDS wheneve37 a c371syst "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a = "_prefs();" na=e * dur37ion number is used to e37sure372syst x_looku0 10 * sna37shot, new parent, etc.)37the 373 9#include <#include < * dis37d="L6" class="line" nam37lms 375syst "L12" class="line" name="L38"> 38 38 * inh3sshot. 38 * 38 * A s37ap_realm struct is main37aine379syst if ("_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) { 38 * wit38 an open cap in the sys38em. 380syst "_prefs();" na=line"pup_e
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) 10 * pro38ided by the MDS wheneve38 a c381syst "_prefs();" na=an>
"_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 * dur38ion number is used to e38sure382syst }#include " * sna38shot, new parent, etc.)38the 383syst "_prefs();" na=pr_eradiv id="fi="L10pr_eraat a(ssued, i.e., n> 8bume=_e"L38"> , "_prefs();" na=rn>
"_prefs();" na=ino1iv id="fi="L10inosyst,#include "
* dis38d="L6" class="line" nam38lms 385syst x_looku"_prefs();" na=eradiv id="fi="L10era"L a 10 #include " * inh38h/mds_client.h" class="38. * 38 * A s38ap_realm struct is main38aine38for realms containing every in" bume=#="co 792d3xn=cepht.c#given ue="v="fs/all3of its lame=r ."L12"> 12 * wit39 an open cap in the sys39em. 39pear to be applied at slightl/"L38"> 38 * pro39ided by the MDS wheneve39 a c391syst hlxr_ voidax_prefs();" na=" bume=_e
* ver39ion number is used to e39sure39rge p{ 38 * sna39shot, new parent, etc.)39the 393syst href="x_prefs();" na=line"e
8anbume=_e , "_prefs();" na=rn>
"_prefs();" na=ino1iv id="fi="L10inosyst, "_prefs();" na=an>
* inh39h/mds_client.h" class="39. *rydiv id="fi="L10="li_for_esna_ea>ryat a("_prefs();" na=lame=div id="fi="L10lame="L a, &"_prefs();" na=an>
"_prefs();" na=name=r v id="fi="L10lame=r at a, "_prefs();" na=came=_a h
* A s3llinux/ceph/decode.h" cl3aaine399syst "_prefs();" na=" bume=_e }#include "/* * Sna40shots in ceph are drive402m. 40> 3#include < * 38 38 12 * whe40her a write logically o406m. 40ealm has an explicit list of /"L38"> 38 * of 40shot. * Thi40 provides a perfect ins409m. 409syst "_prefs();" na=uing the timi="L10u32syst "_prefs();" na=i1iv id="fi="L10i"Lst 10 11/* * Sna4pshots in ceph are drive4n in 412syst if ("_prefs();" na=nu
* cli4ent. In contrast to loc4al fi413syst i"_prefs();" na=dstdiv id="fi="L10dstat a = "_prefs();" na=kcallocdiv id="fi="L10kcallocat a("_prefs();" na=nu
* imp4lement snapshots at a si4ngle 414syst if (!i"_prefs();" na=dstdiv id="fi="L10dstat a) 10 * whe4ther a write logically o4ccurs416syst ceph("_prefs();" na=i1iv id="fi="L10i"Lst = 0 "_prefs();" na=i1iv id="fi="L10i"Lst h/de "_prefs();" na=nu
* sna4pshot. * Thi4s provides a perfect ins4tanta419syst i"_prefs();" na=dstdiv id="fi="L10dstat a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 * cli4ents, however, snapshots4 may 420syst }#include "/* * Sna4sshots in ceph are drive4 in 422syst}#include " * cli4an> * imp4pshots are _not_ file sy4stem-42int i 10 * dis4lies to the subdirectory4 nest42flecting the current parente="L38"> 38 * whe4ectively divides the hie4rarch42ealm has an explicit list of Whef a2e 38 * sna4the files contained by e4ach r42n> 38 12 * Thi4licitly created on that 4realm42for realms containing every i"L12"> 12 * par4ent's snap set _afte4r_ th43pear to be applied at slightl However, if a (sync)h 38 * par4ent (due to, say, a rena4me). 43" id="L12" class="line" namtl t.c#="co"h"l, we invec 15 * dur4ing the time intervals d4uring43hat as realm parameters change("fs/a final#=ize/mtime is known). In /snapcasesp.e"L12"> 12 * &quopen= 8 Whef t.c# 12 * imp4 client is spared most o4f thi43detail, fortunately... it mu* finishms, we __line"finish"cai"e 12 * dis4ntains a hierarchy of re4alms 43flecting the current parent/="L12"> 12 * whe4lm relationship, and for4 each43ealm has an explicit list of Caller must hoe=#="co_rwsem cephreadd(i.e., t.c#ue="v=topology wonesvcvt"L12"> 12 * sna4erited from prior parent4s. 12 38 * A s4nap_realm struct is main4taine439 9voidax_prefs();" na=line"queue"cai"e * wit4h an open cap in the sys4tem. 44esyst{ 38 * par4vided by the MDS wheneve4r a c441syst href="x_prefs();" na=in na1iv id="fi="L10inodeat a i"_prefs();" na=in na1iv id="fi="L10inodeat a = &"_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=vfs_in na1iv id="fi="L10vfs_in na"L a 10 * dur4sion number is used to e4nsure442syst href="x_prefs();" na=line"cai"e * * imp4llinux/slab.h" class="fr4e thi44int i 10 * dis44tains a hierarchy of re44lms 445syst "_prefs();" na=lco" * rea44m relationship, and for44each446syst if (!"_prefs();" na=lco" * sna44rited from prior parent44. 8ENOMEM allocat"L38"> , "_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * A s44ap_realm struct is main44aine449syst }#include " * wit45 an open cap in the sys45em. 4511"> 11 * pro45ided by the MDS wheneve45 a c451syst "_prefs();" na=spin_lockdiv id="fi="L10epin_lockat a(&"_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lockat a) 10 * dur45ion number is used to e45sure452syst "_prefs();" na=use=div id="fi="L10use="L a = "_prefs();" na=__line"lco"_use=div id="fi="L10__line"lco"_use=at a("_prefs();" na=li1iv id="fi="L10ciat a) 10 * * imp45linux/slab.h" class="fr45 thi45int i 10 * dis4dd="L6" class="line" nam4elms 455syst "L12" class="line" name="L38"> 38 * rea45m relationship, and for45each45ealm has an explicit list offfffffff* If t.cre is ah 38 * sna45rited from prior parent45. 38 12 * A s45ap_realm struct is main45aine45for realms containing every eeeeeeeeg/"L38"> 38 * wit46 an open cap in the sys46em. 460syst if ("_prefs();" na=use=div id="fi="L10use="L a & "_prefs();" na=CEPH_CAP_FILE_WRdiv id="fi="L10CEPH_CAP_FILE_WRat a) 10 * pro46ided by the MDS wheneve46 a c461syst "_prefs();" na=dirtsdiv id="fi="L10dirts"L a |= "_prefs();" na=CEPH_CAP_FILE_WRdiv id="fi="L10CEPH_CAP_FILE_WRat a 10 * dur46ion number is used to e46sure46> 3#include < * sna46shot, new parent, etc.)46the 463syst if ("_prefs();" na=__line"inve_pen=&quopen= 8 cai"e 38 * dis46d="L6" class="line" nam46lms 46flecting the current parent/nnnnnnnnnnnnnnnnnnas no L4w# 38 * rea4hh/super.h" class="fref"4>each46ealm has an explicit list offfffffffffffffffff 15 * inh46rited from prior parent46. 38 8queue"cai"e"L38"> , "_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * A s46ap_realm struct is main46aine469syst "_prefs();" na=kfree1iv id="fi="L10kfreeat a("_prefs();" na=lco" * wit47 an open cap in the sys47em. 470syst } else if ("_prefs();" na=dirtsdiv id="fi="L10dirts"L a & ("_prefs();" na=CEPH_CAP_AUTH_EXCL v id="fi="L10CEPH_CAP_AUTH_EXCL"L a|"_prefs();" na=CEPH_CAP_XATTR_EXCL v id="fi="L10CEPH_CAP_XATTR_EXCL"L a| 10 * pro47ided by the MDS wheneve47 a c471syst "_prefs();" na=CEPH_CAP_FILE_EXCL v id="fi="L10CEPH_CAP_FILE_EXCL"L a|"_prefs();" na=CEPH_CAP_FILE_WRdiv id="fi="L10CEPH_CAP_FILE_WRat a)) { 38 * dur47ion number is used to e47sure472syst href="x_prefs();" na=line"e "_prefs();" na=i_head_e * sna47shot, new parent, etc.)47the 473 9#include < 38 * dis47d="L6" class="line" nam47lms 47flecting the current parent/nnnnnnnnnnnnnnnn* if we are a syncf 38 * rea47h/super.h" class="fref"47each47ealm has an explicit list offfffffffnnnnnnnn* 12 * inh4sshot. 38 * * A s47ap_realm struct is main47aine479syst "_prefs();" na=e "_prefs();" na=i_e "_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a 10 * wit48 an open cap in the sys48em. 4811"> 11 * pro48ided by the MDS wheneve48 a c481syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8queue"cai"e"L38"> ,#include " * dur48ion number is used to e48sure482syst "_prefs();" na=in na1iv id="fi="L10inodeat a, "_prefs();" na=cco" * sna48shot, new parent, etc.)48the 483syst "_prefs();" na=ihoe=1iv id="fi="L10ihoe=at a("_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * dis48d="L6" class="line" nam48lms 485syst "_prefs();" na=atomic_seadiv id="fi="L10atomic_setat a(&"_prefs();" na=cco" "_prefs();" na=n="L1iv id="fi="L10n="Lat a, 1) 10 "_prefs();" na=li1iv id="fi="L10ciat a = "_prefs();" na=li1iv id="fi="L10ciat a 10 * inh48h/mds_client.h" class="48. "_prefs();" na=ci_a h
* "_prefs();" na=clush * A s48ap_realm struct is main48aine489 9#include < * wit49 an open cap in the sys49em. 490syst "_prefs();" na=lco" "_prefs();" na=collow"div id="fi="L10collow"at a = "_prefs();" na=e "_prefs();" na=eeqdiv id="fi="L10eeq"Lst 10 * pro49ided by the MDS wheneve49 a c491syst "_prefs();" na=lco" "_prefs();" na=issue=div id="fi="L10issue="L a = "_prefs();" na=__line"lco"_issue=div id="fi="L10__line"lco"_issue=at a("_prefs();" na=li1iv id="fi="L10ciat a, "_prefs();" na=NULL v id="fi="L10NULL"L a) 10 * ver49ion number is used to e49sure492syst "_prefs();" na=lco" "_prefs();" na=dirtsdiv id="fi="L10dirts"L a = "_prefs();" na=dirtsdiv id="fi="L10dirts"L a 10 * sna49shot, new parent, etc.)49the 493 9#include < "_prefs();" na=m na1iv id="fi="L10modeat a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_m na1iv id="fi="L10i_m na"L a 10 * dis49d="L6" class="line" nam49lms 495syst "_prefs();" na=lco" "_prefs();" na=ui=div id="fi="L10ui="L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_ui=div id="fi="L10i_ui="L a 10 "_prefs();" na=gi=div id="fi="L10gi="L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_gi=div id="fi="L10i_gi="L a 10 * inh49h/mds_client.h" class="49. * * A s4llinux/ceph/decode.h" cl4aaine499syst "_prefs();" na=__line"bume=_xattrs_blobdiv id="fi="L10__line"bume=_xattrs_blobat a("_prefs();" na=li1iv id="fi="L10ciat a) 10 "_prefs();" na=xattr_blobdiv id="fi="L10xattr_blob"L a = 10 "_prefs();" na=i_xattrsdiv id="fi="L10i_xattrsat a."_prefs();" na=blobdiv id="fi="L10blob"L a) 10 "_prefs();" na=xattr_versio v id="fi="L10xattr_versio "L a = "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_xattrsdiv id="fi="L10i_xattrsat a."_prefs();" na=versio v id="fi="L10versio "L a 10 * "_prefs();" na=xattr_blobdiv id="fi="L10xattr_blob"L a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 "_prefs();" na=xattr_versio v id="fi="L10xattr_versio "L a = 0 10 * whe50her a write logically o506m. 506syst }#include " * of 50shot. * of 50d="L9" class="line" nam508m. 508syst "L12" class="line" name=Ldirts page count moved from _head" 38 * Thi50 provides a perfect ins509m. 50for realms containing every eeeeeeeeeeeeeeeeeeall3subeequsli# 38 38/* "_prefs();" na=dirts_pagesdiv id="fi="L10dirts_pages"L a = "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_wrbuffer_efs_headdiv id="fi="L10i_wrbuffer_efs_head"L a 10 * Sna5pshots in ceph are drive5n in 512syst "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_wrbuffer_efs_headdiv id="fi="L10i_wrbuffer_efs_head"L a = 0 10 * cli5ent. In contrast to loc5al fi513syst "_prefs();" na=cco" "_prefs();" na=c92d3xndiv id="fi="L10l92d3xn"L a = "_prefs();" na=e * imp5lement snapshots at a si5ngle 514syst "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_head_e "_prefs();" na=i_e "_prefs();" na=nsna="p792d3xndiv id="fi="L10lsna="p792d3xn"L a) 10 * whe5ther a write logically o5ccurs516syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8 L4w#e"L38"> , "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_head_e * of 5pshot. "_prefs();" na=ci_a h
"_prefs();" na=i_lai"e * Thi5s provides a perfect ins5tanta519syst if ("_prefs();" na=use=div id="fi="L10use="L a & "_prefs();" na=CEPH_CAP_FILE_WRdiv id="fi="L10CEPH_CAP_FILE_WRat a) { 38 * cli5ents, however, snapshots5 may 520syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8queue"cai"e"L38"> 38/* 8 seq2 na7;llu use= WR, now#pen="L38"> , "_prefs();" na=in na1iv id="fi="L10inodeat a,#include " * Sna5sshots in ceph are drive5 in 522syst "_prefs();" na=cco" "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 10 * cli5an> "_prefs();" na= * imp5pshots are _not_ file sy5stem-524syst } else { 38 * dis5lies to the subdirectory5 nest525syst "L12" class="line" name=Lnote mtime, size NOW.eg/"L38"> 38 * whe5ectively divides the hie5rarch526syst "_prefs();" na=__line"finish"cai"e * sna5the files contained by e5ach r527syst }#include " * of 5pshots. An individual r5ealm&528syst } else { 38 * Thi5licitly created on that 5realm529syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8queue"cai"e"L38"> , "_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * par5ent's snap set _afte5r_ th530syst "_prefs();" na=kfree1iv id="fi="L10kfreeat a("_prefs();" na=lco" * par5ent (due to, say, a rena5me). 531syst }#include " * dur5ing the time intervals d5uring53> 3#include < * "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lockat a) 10 * imp5 client is spared most o5f thi53detai}#include " * dis5ntains a hierarchy of re5alms 53flect#include " * whe5lm relationship, and for5 each53ealm has an explicit list oe="L38"> 38 * sna5erited from prior parent5s. 38 12 * A s5nap_realm struct is main5taine53for realms containing every i"L12"> 12 * wit5h an open cap in the sys5tem. 54pear to be applied at slightl Ifpcao" 12 * par5vided by the MDS wheneve5r a c54" id="L12" class="line" namtl"L12"> 12 * dur5sion number is used to e5nsure54hat as realm parameters changeCaller must hoe=#i_line"lockn"L12"> 12 * 38 * imp5llinux/slab.h" class="fr5e thi54int iint "_prefs();" na=__line"finish"cai"e#include " * dis54tains a hierarchy of re54lms 545syst href="x_prefs();" na=line"cai"e * rea54m relationship, and for54each546syst{ 38 * sna54rited from prior parent54. "_prefs();" na=vfs_in na1iv id="fi="L10vfs_in na"L a 10 "_prefs();" na=i_sbdiv id="fi="L10i_sb"L a)-0"> "_prefs();" na=mdscdiv id="fi="L10mdsc"L a 10 * A s54ap_realm struct is main54aine549 9#include < * wit55 an open cap in the sys55em. 550syst "_prefs();" na=BUG_ONdiv id="fi="L10BUG_ONat a("_prefs();" na=lco" "_prefs();" na= * pro55ided by the MDS wheneve55 a c551syst "_prefs();" na=lco" "_prefs();" na==izediv id="fi="L10eize"L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_sizediv id="fi="L10i_size"L a 10 * dur55ion number is used to e55sure552syst "_prefs();" na=lco" "_prefs();" na=mtimediv id="fi="L10mtime"L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_mtimediv id="fi="L10i_mtime"L a 10 * "_prefs();" na=atimediv id="fi="L10atime"L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_atimediv id="fi="L10i_atime"L a 10 * imp55linux/slab.h" class="fr55 thi554syst "_prefs();" na=lco" "_prefs();" na=ctimediv id="fi="L10ctime"L a = "_prefs();" na=in na1iv id="fi="L10inodeat a-0"> "_prefs();" na=i_ctimediv id="fi="L10i_ctime"L a 10 * dis5dd="L6" class="line" nam5elms 555syst "_prefs();" na=lco" "_prefs();" na=time_wari"eeqdiv id="fi="L10time_wari"eeq"L a = "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_time_wari"eeqdiv id="fi="L10i_time_wari"eeq"L a 10 * rea55m relationship, and for55each556syst if ("_prefs();" na=lco" "_prefs();" na=dirts_pagesdiv id="fi="L10dirts_pages"L a) { 38 * sna55rited from prior parent55. 8finish"cai"e"L38"> 38 8still has na7;dLdirts pages\na>"L38"> , "_prefs();" na=in na1iv id="fi="L10inodeat a, "_prefs();" na=cco" * A s55ap_realm struct is main55aine559syst "_prefs();" na=cco" "_prefs();" na=c92d3xndiv id="fi="L10l92d3xn"L a, "_prefs();" na=cco" "_prefs();" na=c92d3xndiv id="fi="L10l92d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst, 38 * wit56 an open cap in the sys56em. 560syst x_prefs();" na=line"cai"e> "_prefs();" na=dirtsdiv id="fi="L10dirts"L a), "_prefs();" na=lco" "_prefs();" na==izediv id="fi="L10eize"L a, 38 * pro56ided by the MDS wheneve56 a c561syst "_prefs();" na=cco" "_prefs();" na=dirts_pagesdiv id="fi="L10dirts_pages"L a) 10 * dur56ion number is used to e56sure562syst x_looku0 10 * sna56shot, new parent, etc.)56the 563syst }#include " 8finish"cai"e"L38"> ,#include " * dis56d="L6" class="line" nam56lms 565syst "_prefs();" na=in na1iv id="fi="L10inodeat a, "_prefs();" na=cco" "_prefs();" na=c92d3xndiv id="fi="L10l92d3xn"L a,#include " * rea5hh/super.h" class="fref"5>each566syst "_prefs();" na=cco" "_prefs();" na=c92d3xndiv id="fi="L10l92d3xn"L a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst, x_prefs();" na=line"cai"e> "_prefs();" na=dirtsdiv id="fi="L10dirts"L a),#include " * sna56rited from prior parent56. "_prefs();" na==izediv id="fi="L10eize"L a) 10 * A s56ap_realm struct is main56aine569syst "_prefs();" na=epin_lockdiv id="fi="L10epin_lockat a(&"_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na== * wit57 an open cap in the sys57em. 570syst "_prefs();" na=="li_add_taildiv id="fi="L10="li_add_tailat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e "_prefs();" na== * pro57ided by the MDS wheneve57 a c571syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na== * dur57ion number is used to e57sure572syst x_looku1; "L12" class="line" name=Lcaller may want" 38 * sna57shot, new parent, etc.)57the 573 9}#include " * dis57d="L6" class="line" nam57lms 57flecting the current parente="L38"> 38 * rea57h/super.h" class="fref"57each57ealm has an explicit list of* Queue cai"e 12 * inh5sshot. 12 38 * A s57ap_realm struct is main57aine579syst="lxr_ voidax_prefs();" na=queue"ue="v_lai"e * wit58 an open cap in the sys58em. 58esyst{ 38 * pro58ided by the MDS wheneve58 a c581syst href="x_prefs();" na=line"in na"info1iv id="fi="L10line"in na"infoat a i"_prefs();" na=li1iv id="fi="L10ciat a 10 * dur58ion number is used to e58sure582syst href="x_prefs();" na=in na1iv id="fi="L10inodeat a i"_prefs();" na= idtin na1iv id="fi="L10 idtin na"L a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 * sna58shot, new parent, etc.)58the 583syst href="x_prefs();" na=line"e * dis58d="L6" class="line" nam58lms 585syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8queue"ue="v_lai"e"L38"> , "_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a) 10 * inh58h/mds_client.h" class="58. "_prefs();" na=inonas_wite"lco"_lockdiv id="fi="L10inonas_wite"lco"_lock"L a) 10 "_prefs();" na=inonas_wite"lco"div id="fi="L10inonas_wite"lco""L a,#include " * A s58ap_realm struct is main58aine589syst "_prefs();" na=i"e * wit59 an open cap in the sys59em. 590syst href="x_prefs();" na=in na1iv id="fi="L10inodeat a i"_prefs();" na=in na1iv id="fi="L10inodeat a = "_prefs();" na=igrabdiv id="fi="L10igrabat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=vfs_in na1iv id="fi="L10vfs_in na"L a) 10 * pro59ided by the MDS wheneve59 a c591syst if (!"_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * dur59ion number is used to e59sure592syst l92dinue 10 * sna59shot, new parent, etc.)59the 593syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=inonas_wite"lco"_lockdiv id="fi="L10inonas_wite"lco"_lock"L a) 10 * dis59d="L6" class="line" nam59lms 595syst "_prefs();" na=iputdiv id="fi="L10iputat a("_prefs();" na= idtin na1iv id="fi="L10 idtin na"L a) 10 * inh59h/mds_client.h" class="59. "_prefs();" na=inonas_wite"lco"_lockdiv id="fi="L10inonas_wite"lco"_lock"L a) 10 * A s5llinux/ceph/decode.h" cl5aaine599syst }#include " "_prefs();" na=inonas_wite"lco"_lockdiv id="fi="L10inonas_wite"lco"_lock"L a) 10 * "_prefs();" na=childrendiv id="fi="L10lhildren"Lst, x_prefs();" na=lhild_a h
8queue"ue="v_lai"e"L38"> ,#include " * whe60her a write logically o606m. 606syst "_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a, x_prefs();" na=lhilddiv id="fi="L10lhild"L a, x_prefs();" na=lhilddiv id="fi="L10lhild"L a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a) 10 * of 60shot. "_prefs();" na=dirts_a h
"_prefs();" na=dirts_a h
"_prefs();" na=dirts_a h
#include " 11/* "_prefs();" na=dirts_a h
* Sna6pshots in ceph are drive6n in 612syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8queue"ue="v_lai"e"L38"> , "_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a) 10 * cli6ent. In contrast to loc6al fi613 9}#include " * imp6lement snapshots at a si6ngle 61int i 10 38 * whe6ther a write logically o6ccurs61ealm has an explicit list of* Parse="fs/apply a s"coblob >&quoe 8 from t.c#MDS. T.is#specifiea"L38"> 38 * of 6pshot. 38 12 * Thi6s provides a perfect ins6tanta61for realms containing every i"L12"> 12 * cli6ents, however, snapshots6 may 62pear to be applied at slightl Caller must hoe=#e 12/* 38 * Sna6sshots in ceph are drive6 in 622systint "_prefs();" na=line"update_e#include " * cli6an> * imp6pshots are _not_ file sy6stem-624syst{ 38 * dis6lies to the subdirectory6 nest625syst href="x_prefs();" na=line"mds_e 38 * whe6ectively divides the hie6rarch626syst "_prefs();" na=__le6linux/slabi="L10__le6lat a i"_prefs();" na=e 38 * of 6the files contained by e6ach r627syst "_prefs();" na=__le6linux/slabi="L10__le6lat a i"_prefs();" na=prior_par" n"e 38 * Thi6licitly created on that 6realm629syst int "_prefs();" na=invalidate1iv id="fi="L10invalidate"L a = 0 10 * par6ent's snap set _afte6r_ th630syst int "_prefs();" na=errdiv id="fi="L10err"L a = -"_prefs();" na=ENOMEMdiv id="fi="L10ENOMEMat a 10 * par6ent (due to, say, a rena6me). 631syst "_prefs();" na=LIST_HEAD1iv id="fi="L10LIST_HEADat a("_prefs();" na=dirts_r id=sdiv id="fi="L10dirts_r id=s"L a) 10 * dur6ing the time intervals d6uring63> 3#include < * 8update_e"L38"> , "_prefs();" na=deletio v id="fi="L10deletio "L a) 10 * imp6 client is spared most o6f thi63detai"_prefs();" na=morediv id="fi="L10moreetai: 10 * dis6ntains a hierarchy of re6alms 635syst "_prefs();" na=line"de" na_L41"div id="fi="L10line"de" na_L41"at a(&"_prefs();" na=sdiv id="fi="L10s"L a, "_prefs();" na=ediv id="fi="L10eat a, eizeof(i"_prefs();" na=ri1iv id="fi="L10riat a), "_prefs();" na=baddiv id="fi="L10bad"L a) 10 * whe6lm relationship, and for6 each636syst "_prefs();" na=ri1iv id="fi="L10riat a = "_prefs();" na=sdiv id="fi="L10s"L a 10 * of 6erited from prior parent6s. "_prefs();" na=num"e * Thi6nap_realm struct is main6taine639syst "_prefs();" na= e32_to_cpudiv id="fi="L10=e32_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=num"prior_par" n"e * wit6h an open cap in the sys6tem. 640syst "_prefs();" na=s * par6vided by the MDS wheneve6r a c641syst "_prefs();" na=sdiv id="fi="L10s"L a += eizeof("_prefs();" na=u6linux/slabi="L10u6lat a) * "_prefs();" na= e32_to_cpudiv id="fi="L10=e32_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=num"e * dur6sion number is used to e6nsure642syst "_prefs();" na=prior_par" n"e * "_prefs();" na=num"prior_par" n"e * imp6llinux/slab.h" class="fr6e thi64int i 10 * dis64tains a hierarchy of re64lms 645syst "_prefs();" na=r id=div id="fi="L10r id=at a = "_prefs();" na=line"lookup"e "_prefs();" na=ino1iv id="fi="L10ino"L a)) 10 * whe64m relationship, and for64each646syst if (!"_prefs();" na=r id=div id="fi="L10r id=at a) { 38 * sna64rited from prior parent64. "_prefs();" na=ino1iv id="fi="L10ino"L a)) 10 * Thi64ap_realm struct is main64aine649syst "_prefs();" na=errdiv id="fi="L10err"L a = "_prefs();" na=PTR_ERRdiv id="fi="L10PTR_ERRat a("_prefs();" na=r id=div id="fi="L10r id=at a) 10 * wit65 an open cap in the sys65em. 650syst goto "_prefs();" na=faildiv id="fi="L10failat a 10 * par65ided by the MDS wheneve65 a c651syst }#include " * dur65ion number is used to e65sure652syst }#include " *#include < * imp65linux/slab.h" class="fr65 thi654syst "L12" class="line" name=Lensure t.c#par" n is correcttl/"L38"> 38 * dis6dd="L6" class="line" nam6elms 655syst "_prefs();" na=errdiv id="fi="L10err"L a = "_prefs();" na=adjust_e "_prefs();" na=par" ndiv id="fi="L10par" nat a)) 10 * rea65m relationship, and for65each656syst if ("_prefs();" na=errdiv id="fi="L10err"L a < 0) 10 * sna65rited from prior parent65. * Thi65ap_realm struct is main65aine659 9#include < * wit66 an open cap in the sys66em. 660syst if ("_prefs();" na= e64_to_cpudiv id="fi="L10=e64_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 0"> "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) { 38 * pro66ided by the MDS wheneve66 a c661syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8update_e 2 na7;lld\na>"L38"> ,#include " * dur66ion number is used to e66sure662syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a, x_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst, x_prefs();" na= e64_to_cpudiv id="fi="L10=e64_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst)) 10 * sna66shot, new parent, etc.)66the 663syst "L12" class="line" name=Lupdate ue="v=parrefters,#e 38 "_prefs();" na=eeqdiv id="fi="L10eeq"Lst = "_prefs();" na= e64_to_cpudiv id="fi="L10=e64_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 10 * dis66d="L6" class="line" nam66lms 665syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=cr ite"div id="fi="L10lr ite""Lst = "_prefs();" na= e64_to_cpudiv id="fi="L10=e64_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=cr ite"div id="fi="L10lr ite""Lst) 10 * rea6hh/super.h" class="fref"6>each666syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=par" n"eincediv id="fi="L10par" n"eince"Lst = "_prefs();" na= e64_to_cpudiv id="fi="L10=e64_to_cpuat a("_prefs();" na=ri1iv id="fi="L10riat a-0"> "_prefs();" na=par" n"eincediv id="fi="L10par" n"eince"Lst) 10 * sna66rited from prior parent66. "_prefs();" na=num"e "_prefs();" na=num"e * A s66ap_realm struct is main66aine669syst "_prefs();" na=errdiv id="fi="L10err"L a = "_prefs();" na=dup_arrasdiv id="fi="L10dup_arrasat a(&"_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=e "_prefs();" na=num"e * wit67 an open cap in the sys67em. 670syst if ("_prefs();" na=errdiv id="fi="L10err"L a < 0) 10 * pro67ided by the MDS wheneve67 a c671syst goto "_prefs();" na=faildiv id="fi="L10failat a 10 * dur67ion number is used to e67sure67> 3#include < * sna67shot, new parent, etc.)67the 673syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=num"prior_par" n"e#include < "_prefs();" na=num"prior_par" n"e * dis67d="L6" class="line" nam67lms 675syst "_prefs();" na=errdiv id="fi="L10err"L a = "_prefs();" na=dup_arrasdiv id="fi="L10dup_arrasat a(&"_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=prior_par" n"e * rea67h/super.h" class="fref"67each676syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=num"prior_par" n"e * sna6sshot. * A s67ap_realm struct is main67aine679 9#include < * wit68 an open cap in the sys68em. 680syst "L12" class="line" name=Lqueue ue="v=cephcai"e 38 * pro68ided by the MDS wheneve68 a c681syst "_prefs();" na=="li_adddiv id="fi="L10="li_addat a(&"_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=dirts_a h
* dur68ion number is used to e68sure68> 3#include < * sna68shot, new parent, etc.)68the 683syst "_prefs();" na=invalidate1iv id="fi="L10invalidate"L a = 1 10 "_prefs();" na=cached_c92d3xndiv id="fi="L10lached_c92d3xn"Lst) { 38 * dis68d="L6" class="line" nam68lms 685syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8update_e"L38"> ,#include " "_prefs();" na=ino1iv id="fi="L10ino"L a, x_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 10 * sna68h/mds_client.h" class="68. * A s68ap_realm struct is main68aine689syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8update_e"L38"> ,#include " * wit69 an open cap in the sys69em. 690syst "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a, x_prefs();" na=r id=div id="fi="L10r id=at a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=eeqdiv id="fi="L10eeq"Lst) 10 * pro69ided by the MDS wheneve69 a c691syst }#include " * dur69ion number is used to e69sure69> 3#include < * sna69shot, new parent, etc.)69the 693syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8done wite na7;llx na7;p, invalidated= na7;d, na7;p2 na7;p\na>"L38"> , "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a,#include < * dis69d="L6" class="line" nam69lms 695syst 10 * sna69h/mds_client.h" class="69. * A s6llinux/ceph/decode.h" cl6aaine699syst "L12" class="line" name=Linvalidate when we ue=ch t.c#_end_ (root)3of/t.c#trace /"L38"> 38 38 38 12 * whe70her a write logically o706m. 70ealm has an explicit list oftttttttt=/"L38"> 38#include < /* * Sna7pshots in ceph are drive7n in 71> 3#include < * cli7ent. In contrast to loc7al fi713syst "_prefs();" na=__cleanup_empts_r id=sdiv id="fi="L10__cleanup_empts_r id=sat a("_prefs();" na=mdscdiv id="fi="L10mdsc"L a) 10 * * whe7ther a write logically o7ccurs71ealm h_prefs();" na=baddiv id="fi="L10bad"L a: 10 * of 7pshot. 8update_e"L38"> , "_prefs();" na=errdiv id="fi="L10err"L a) 10 * cli7ents, however, snapshots7 may 720syst x_looku"_prefs();" na=errdiv id="fi="L10err"L a 10 /*#include " * Sna7sshots in ceph are drive7 in 72> 3#include < * cli7an> * imp7pshots are _not_ file sy7stem-724syst"L12" class="line" name="L38"> 38 * dis7lies to the subdirectory7 nest72flecting the current parentt* Sefs/any cai"e 38 * whe7ectively divides the hie7rarch72ealm has an explicit list of* s_mud3x across multiplc#e 12 * of 7the files contained by e7ach r72n> 12 12 38 * par7ent's snap set _afte7r_ th730syst="lxr_ voidax_prefs();" na=flush_e * par7ent (due to, say, a rena7me). 731syst{ 38 * dur7ing the time intervals d7uring732syst href="x_prefs();" na=line"in na"info1iv id="fi="L10line"in na"infoat a i"_prefs();" na=li1iv id="fi="L10ciat a 10 * * imp7 client is spared most o7f thi734syst href="x_prefs();" na=line"mds_eessio v id="fi="L10line"mds_eessio at a i"_prefs();" na=eessio v id="fi="L10eessio at a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 * dis7ntains a hierarchy of re7alms 735syst 10 * whe7lm relationship, and for7 each736syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8flush_e"L38"> ) 10 * of 7erited from prior parent7s. "_prefs();" na== "_prefs();" na== * Thi7nap_realm struct is main7taine739syst "_prefs();" na=li1iv id="fi="L10ciat a = "_prefs();" na=="li_cirli_e nrsdiv id="fi="L10="li_cirli_e nrsat a(&"_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na==#include < * wit7h an open cap in the sys7tem. 740syst href="x_prefs();" na=line"in na"info1iv id="fi="L10line"in na"infoat a, "_prefs();" na=i_= * par7vided by the MDS wheneve7r a c741syst "_prefs();" na=in na1iv id="fi="L10inodeat a = &"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=vfs_in na1iv id="fi="L10vfs_in na"L a 10 * dur7sion number is used to e7nsure742syst "_prefs();" na=ihoe=1iv id="fi="L10ihoe=at a("_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * "_prefs();" na== * imp7llinux/slab.h" class="fr7e thi744syst "_prefs();" na=epin_lockdiv id="fi="L10epin_lockat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lock"L a) 10 * dis74tains a hierarchy of re74lms 745syst "_prefs();" na=__line"flush_e * whe74m relationship, and for74each746syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lock"L a) 10 * of 74rited from prior parent74. "_prefs();" na== * Thi74ap_realm struct is main74aine749syst }#include " * wit75 an open cap in the sys75em. 750syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na== * par75ided by the MDS wheneve75 a c751syst 10 * dur75ion number is used to e75sure752syst if ("_prefs();" na=eessio v id="fi="L10eessio at a) { 38 * "_prefs();" na==_mud3x v id="fi="L10e_mud3x"L a) 10 * imp75linux/slab.h" class="fr75 thi754syst "_prefs();" na=line"put"mds_eessio v id="fi="L10line"put"mds_eessio at a("_prefs();" na=eessio v id="fi="L10eessio at a) 10 * dis7dd="L6" class="line" nam7elms 755syst }#include " * whe75m relationship, and for75each756syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8flush_e"L38"> ) 10 * of 75rited from prior parent75.#include " * of 75n> * Thi75ap_realm struct is main75aine759 9#include < * wit76 an open cap in the sys76em. 76pear to be applied at slighe="L38"> 38 * pro76ided by the MDS wheneve76 a c76" id="L12" class="line" namtl Handle a s"co notificition from t.c#MDS."L38"> 38 * dur76ion number is used to e76sure762syst href="fs/ceph/snap.c#Lg"L12"> 12 * sna76shot, new parent, etc.)76the 763syst"L12" class="line" namtl T.is#can take two basic=cepms:et.c#eimplesn is just a s"co lr ition"L12"> 12 * imp76linux/slab.h" class="fr76 thi764syst"L12" class="line" namt* or deletio notificition on 2" exist 12 * dis76d="L6" class="line" nam76lms 76flecting the current parentt* ue="v="fs/nts lhildren."L38"> 38 * whe7hh/super.h" class="fref"7>each76ealm has an explicit list of*"L38"> 38 * of 76rited from prior parent76. 38 38 * Thi76ap_realm struct is main76aine76for realms containing every i directory inta anotherLr id=."L38"> 38 * wit77 an open cap in the sys77em. 77pear to be applied at slightl/"L38"> 38 * pro77ided by the MDS wheneve77 a c771systvoidax_prefs();" na=line"handle_e#include < * dur77ion number is used to e77sure772syst href="x_prefs();" na=line"mds_eessio v id="fi="L10line"mds_eessio at a i"_prefs();" na=eessio v id="fi="L10eessio at a,#include < * sna77shot, new parent, etc.)77the 773syst href="x_prefs();" na=line"msg v id="fi="L10line"msgat a i"_prefs();" na=msg v id="fi="L10msgat a) 10 * dis77d="L6" class="line" nam77lms 775syst href="x_prefs();" na=super_blockdiv id="fi="L10euper_blockat a i"_prefs();" na=ebdiv id="fi="L10ebat a = "_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na=fscdiv id="fi="L10fsc"L a-0"> "_prefs();" na==bdiv id="fi="L10ebat a 10 * rea77h/super.h" class="fref"77each776syst int "_prefs();" na=mdsdiv id="fi="L10mdsat a = "_prefs();" na=eessio v id="fi="L10eessio at a-0"> "_prefs();" na==_mdsdiv id="fi="L10=_mdsat a 10 * of 7sshot. * A s77ap_realm struct is main77aine779syst int "_prefs();" na=trace_le v id="fi="L10trace_le "L a 10 * wit78 an open cap in the sys78em. 780syst href="x_prefs();" na=line"e * pro78ided by the MDS wheneve78 a c781syst voidai"_prefs();" na=sdiv id="fi="L10s"L a = "_prefs();" na=msg v id="fi="L10msgat a-0"> "_prefs();" na=fro naiv id="fi="L10fro nat a."_prefs();" na=iov_basa1iv id="fi="L10iov_basa"L a 10 * dur78ion number is used to e78sure782syst voidai"_prefs();" na=ediv id="fi="L10eat a = "_prefs();" na=sdiv id="fi="L10s"L a + "_prefs();" na=msg v id="fi="L10msgat a-0"> "_prefs();" na=fro naiv id="fi="L10fro nat a."_prefs();" na=iov_le v id="fi="L10iov_le "L a 10 * sna78shot, new parent, etc.)78the 783syst href="x_prefs();" na=line"mds_e * dis78d="L6" class="line" nam78lms 785syst "_prefs();" na=__le6linux/slabi="L10__le6lat a i"_prefs();" na=eplit_in sdiv id="fi="L10eplit_in sat a = "_prefs();" na=NULL v id="fi="L10NULL"L a, i"_prefs();" na=eplit_r id=sdiv id="fi="L10eplit_r id=s"L a = "_prefs();" na=NULL v id="fi="L10NULL"L a 10 * rea78h/super.h" class="fref"78each786syst int "_prefs();" na=i1iv id="fi="L10iat a 10 * sna78h/mds_client.h" class="78. * A s78ap_realm struct is main78aine789syst "L12" class="line" name=Lde" natl/"L38"> 38 * wit79 an open cap in the sys79em. 790syst if ("_prefs();" na=msg v id="fi="L10msgat a-0"> "_prefs();" na=fro naiv id="fi="L10fro nat a."_prefs();" na=iov_le v id="fi="L10iov_le "L a < eizeof(i"_prefs();" na=h v id="fi="L10h"L a)) 10 * pro79ided by the MDS wheneve79 a c791syst goto "_prefs();" na=baddiv id="fi="L10bad"L a 10 * dur79ion number is used to e79sure792syst "_prefs();" na=h v id="fi="L10h"L a = "_prefs();" na=sdiv id="fi="L10s"L a 10 * sna79shot, new parent, etc.)79the 793syst "_prefs();" na=os v id="fi="L10os"L a = "_prefs();" na= e32_to_cpudiv id="fi="L10=e32_to_cpuat a("_prefs();" na=h v id="fi="L10h"L a-0"> "_prefs();" na=os v id="fi="L10os"L a) 10 "_prefs();" na=splitdiv id="fi="L10splitat a); "L12" class="line" name=Lnon-zero if we areLsplitt 12 * dis79d="L6" class="line" nam79lms 79flecting the current parenttttttttttttttttttttttttttttttttttttttttttt* exist 38 * rea79h/super.h" class="fref"79each796syst "_prefs();" na=num"eplit_in sdiv id="fi="L10num"eplit_in sat a = "_prefs();" na= e32_to_cpudiv id="fi="L10=e32_to_cpuat a("_prefs();" na=h v id="fi="L10h"L a-0"> "_prefs();" na=num"eplit_in sdiv id="fi="L10num"eplit_in sat a) 10 * sna79h/mds_client.h" class="79. "_prefs();" na=num"eplit_r id=sdiv id="fi="L10num"eplit_r id=s"L a) 10 "_prefs();" na=trace_le v id="fi="L10trace_le "L a) 10 * A s7llinux/ceph/decode.h" cl7aaine799syst "_prefs();" na=pdiv id="fi="L10s"L a += eizeof(i"_prefs();" na=h v id="fi="L10h"L a) 10 8handle_e"L38"> , "_prefs();" na=mdsdiv id="fi="L10mdsat a,#include < "_prefs();" na==_mud3x v id="fi="L10e_mud3x"L a) 10 "_prefs();" na==_eeqdiv id="fi="L10e_eeq"Lst++ 10 "_prefs();" na==_mud3x v id="fi="L10e_mud3x"L a) 10 * of 80d="L9" class="line" nam808m. 808syst "_prefs();" na=down_write1iv id="fi="L10down_writeat a(&"_prefs();" na=mdscdiv id="fi="L10mdsc"L a-0"> "_prefs();" na== /* * Sna8pshots in ceph are drive8n in 812syst href="x_prefs();" na=line"mds_e #include < 38 38 38 38 38 38 * cli8ents, however, snapshots8 may 820syst "_prefs();" na=eplit_in sdiv id="fi="L10eplit_in sat a = "_prefs();" na=sdiv id="fi="L10s"L a 10 /* * Sna8sshots in ceph are drive8 in 822syst "_prefs();" na=eplit_r id=sdiv id="fi="L10eplit_r id=s"L a = "_prefs();" na=sdiv id="fi="L10s"L a 10 * imp8pshots are _not_ file sy8stem-824syst "_prefs();" na=line"de" na_nee"div id="fi="L10line"de" na_nee"at a(&"_prefs();" na=pdiv id="fi="L10p"L a, "_prefs();" na=ediv id="fi="L10eat a, eizeof(i"_prefs();" na=ri1iv id="fi="L10riat a), "_prefs();" na=baddiv id="fi="L10bad"L a) 10 * dis8lies to the subdirectory8 nest825syst "L12" class="line" name=Lwe will peek at r id=3info here, but will _not_"L38"> 38 38 38 * par8ent's snap set _afte8r_ th830syst "_prefs();" na=r id=div id="fi="L10r id=at a = "_prefs();" na=line"lookup_e#include </* * dur8ing the time intervals d8uring832syst "_prefs();" na=r id=div id="fi="L10r id=at a = "_prefs();" na=line"lr ite_e#include < * imp8 client is spared most o8f thi834syst goto "_prefs();" na=outdiv id="fi="L10outat a;#include < * dis8ntains a hierarchy of re8alms 835syst }#include " * whe8lm relationship, and for8 each836syst "_prefs();" na=line"get_e * of 8erited from prior parent8s. 8splitt"L38"> , "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a, "_prefs();" na=r id=div id="fi="L10r id=at a) 10 * wit8h an open cap in the sys8tem. 840syst href="x_prefs();" na=line"vino1iv id="fi="L10line"vinosyst x_prefs();" na=vino1iv id="fi="L10vinosyst = { 38/*#include < * dur8sion number is used to e8nsure842syst ."_prefs();" na=e#include < * * imp8llinux/slab.h" class="fr8e thi844syst href="x_prefs();" na=in na1iv id="fi="L10inodeat a i"_prefs();" na=in na1iv id="fi="L10inodeat a = "_prefs();" na=line"find_in na1iv id="fi="L10line"find_in naat a("_prefs();" na=ebdiv id="fi="L10ebat a, "_prefs();" na=vino1iv id="fi="L10vinosyst) 10 * dis84tains a hierarchy of re84lms 845syst href="x_prefs();" na=line"in na"info1iv id="fi="L10line"in na"infoat a i"_prefs();" na=li1iv id="fi="L10ciat a 10 * whe84m relationship, and for84each846syst href="x_prefs();" na=line"e * of 84rited from prior parent84. * wit85 an open cap in the sys85em. 850syst "_prefs();" na=li1iv id="fi="L10ciat a = "_prefs();" na=line"in na1iv id="fi="L10line"in naat a("_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * par85ided by the MDS wheneve85 a c851syst 10 * dur85ion number is used to e85sure852syst "_prefs();" na=epin_lockdiv id="fi="L10epin_lockat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lock"L a) 10 * "_prefs();" na=i_e * imp85linux/slab.h" class="fr85 thi854syst goto "_prefs();" na=skip"in na1iv id="fi="L10skip"in naat a 10 * dis8dd="L6" class="line" nam8elms 855syst "o be applied at slighe="L38"> 38 * whe85m relationship, and for85each85ealm has an explicit list oftttttttttttttttttttttttt* If/t.is/inode belongs" 38 * of 85rited from prior parent85. 38 38 38 * wit86 an open cap in the sys86em. 86pear to be applied at sligh tttttttttttttttttttttttt* t.is/inode."L38"> 38 * pro86ided by the MDS wheneve86 a c86" id="L12" class="line" namttttttttttttttttttttttttt*/"L38"> 38 * dur86ion number is used to e86sure862syst if ("_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e "_prefs();" na=cr ited1iv id="fi="L10cr itedat a &"> 38 * "_prefs();" na=cr ited1iv id="fi="L10cr itedat a)) { 38 * imp86linux/slab.h" class="fr86 thi864syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8 leav"L38"> , 38 * dis86d="L6" class="line" nam86lms 865syst "_prefs();" na=in na1iv id="fi="L10inodeat a, "_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e "_prefs();" na=ino1iv id="fi="L10ino"L a,#include < * whe8hh/super.h" class="fref"8>each866syst "_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e * of 86rited from prior parent86. #include " * Thi86ap_realm struct is main86aine869syst "_prefs();" na=doutdiv id="fi="L10doutat a(ssued, i.e., n> 8 will moveL na7;p2"L38"> , 38 * wit87 an open cap in the sys87em. 870syst "_prefs();" na=in na1iv id="fi="L10inodeat a, "_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=ino1iv id="fi="L10ino"L a, "_prefs();" na=r id=div id="fi="L10r id=at a) 10 * pro87ided by the MDS wheneve87 a c871syst "o be applied at slighe="L38"> 38 * dur87ion number is used to e87sure872syst href="fs/ceph/snap.c#LLLLLLLLLLLLLLLLLLLLLLLLL* MoveLt.c#inode to/t.c#new r id=at38"> 38 * 38 "_prefs();" na=inodes_wite_lais"lockdiv id="fi="L10inodes_wite_lais"lockat a) 10 * dis87d="L6" class="line" nam87lms 875syst "_prefs();" na= "li_del"initdiv id="fi="L10 "li_del"initat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e * whe87h/super.h" class="fref"87each876syst "_prefs();" na= "li_add1iv id="fi="L10 "li_addat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e * of 8sshot. "_prefs();" na=inodes_wite_laisdiv id="fi="L10inodes_wite_laisat a) 10 "_prefs();" na=i_e * Thi87ap_realm struct is main87aine879syst "_prefs();" na=li1iv id="fi="L10ciat a-0"> "_prefs();" na=i_e * wit88 an open cap in the sys88em. 880syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=r id=div id="fi="L10r id=at a-0"> "_prefs();" na=inodes_wite_lais"lockdiv id="fi="L10inodes_wite_lais"lockat a) 10 * pro88ided by the MDS wheneve88 a c881syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lock"L a) 10 * dur88ion number is used to e88sure88> 3#include < * sna88shot, new parent, etc.)88the 883syst "_prefs();" na=line"get_e * dis88d="L6" class="line" nam88lms 885syst 10 * rea88h/super.h" class="fref"88each886syst "_prefs();" na=iputdiv id="fi="L10iputat a("_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * sna88h/mds_client.h" class="88. * A s88ap_realm struct is main88aine889syst"_prefs();" na=skip"in na1iv id="fi="L10skip"in naat a: 10 * wit89 an open cap in the sys89em. 890syst "_prefs();" na=spin_unlockdiv id="fi="L10epin_unlockat a(&"_prefs();" na=ci1iv id="fi="L10ciat a-0"> "_prefs();" na=i_line"lockdiv id="fi="L10i_line"lock"L a) 10 * pro89ided by the MDS wheneve89 a c891syst "_prefs();" na=iputdiv id="fi="L10iputat a("_prefs();" na=in na1iv id="fi="L10inodeat a) 10 * dur89ion number is used to e89sure892syst }#include " * sna89shot, new parent, etc.)89the 893 9#include < 38 * dis89d="L6" class="line" nam89lms 895syst ceph("_prefs();" na=i1iv id="fi="L10iat a = 0; "_prefs();" na=i1iv id="fi="L10iat a < "_prefs();" na=num"eplit_r id=sdiv id="fi="L10num"eplit_r id=s"L a "_prefs();" na=i1iv id="fi="L10iat a++) { 38 * rea89h/super.h" class="fref"89each896syst href="x_prefs();" na=line"e * sna89h/mds_client.h" class="89. * A s8llinux/ceph/decode.h" cl8aaine899syst if (!"_prefs();" na=childdiv id="fi="L10lhildat a) 10 "_prefs();" na=ino1iv id="fi="L10ino"L a) 10 38 38 38 38 /* * Sna9pshots in ceph are drive9n in 912syst if ("_prefs();" na=os v id="fi="L10os"L a == "_prefs();" na=CEPH_SNAP_OP_SPLIT v id="fi="L10CEPH_SNAP_OP_SPLIT"L a) 10 38 * "_prefs();" na== * cli9ents, however, snapshots9 may 920syst "_prefs();" na=flush_e /* * Sna9sshots in ceph are drive9 in 92> 3#include < * imp9pshots are _not_ file sy9stem-924syst "_prefs();" na=pr_errdiv id="fi="L10pr_errat a("sued, i.e., n> 8corrupt e"L38"> , "_prefs();" na=mdsdiv id="fi="L10mdsat a) 10 "_prefs();" na== * par9ent's snap set _afte9r_ th930syst}#include "/* * dur9ing the time intervals d9uring93> 3#include <#include < * imp9 client is spared most o9f thi934syst
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