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find: Implement real -ignore_readdir_race.

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If -ignore_readdir_race is present, [ENOENT] errors caused by deleting a
file after find has read its name from a directory are ignored.

Formerly, -ignore_readdir_race did nothing.

PR:		bin/169723
Submitted by:	Valery Khromov and Andrey Ignatov
This commit is contained in:
Jilles Tjoelker 2012-07-25 21:59:10 +00:00
parent 7f14a4d6b1
commit 40072dc2b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=238780
6 changed files with 38 additions and 8 deletions
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4
usr.bin/find/extern.h
View File

@ -58,6 +58,7 @@ creat_f c_flags;
creat_f c_follow;
creat_f c_fstype;
creat_f c_group;
creat_f c_ignore_readdir_race;
creat_f c_inum;
creat_f c_links;
creat_f c_ls;
@ -111,7 +112,8 @@ exec_f f_size;
exec_f f_type;
exec_f f_user;
extern int ftsoptions, isdeprecated, isdepth, isoutput, issort, isxargs;
extern int ftsoptions, ignore_readdir_race, isdeprecated, isdepth, isoutput;
extern int issort, isxargs;
extern int mindepth, maxdepth;
extern int regexp_flags;
extern time_t now;

10
usr.bin/find/find.1
View File

@ -31,7 +31,7 @@
.\" @(#)find.1 8.7 (Berkeley) 5/9/95
.\" $FreeBSD$
.\"
.Dd June 13, 2012
.Dd July 25, 2012
.Dt FIND 1
.Os
.Sh NAME
@ -470,7 +470,9 @@ is numeric and there is no such group name, then
.Ar gname
is treated as a group ID.
.It Ic -ignore_readdir_race
This option is for GNU find compatibility and is ignored.
Ignore errors because a file or a directory is deleted
after reading the name from a directory.
This option does not affect errors occurring on starting points.
.It Ic -ilname Ar pattern
Like
.Ic -lname ,
@ -618,7 +620,9 @@ is equivalent to
.It Ic -nogroup
True if the file belongs to an unknown group.
.It Ic -noignore_readdir_race
This option is for GNU find compatibility and is ignored.
Turn off the effect of
.Ic -ignore_readdir_race .
This is default behaviour.
.It Ic -noleaf
This option is for GNU find compatibility.
In GNU find it disables an optimization not relevant to

8
usr.bin/find/find.c
View File

@ -197,8 +197,12 @@ find_execute(PLAN *plan, char *paths[])
continue;
break;
case FTS_DNR:
case FTS_ERR:
case FTS_NS:
if (ignore_readdir_race &&
entry->fts_errno == ENOENT && entry->fts_level > 0)
continue;
/* FALLTHROUGH */
case FTS_ERR:
(void)fflush(stdout);
warnx("%s: %s",
entry->fts_path, strerror(entry->fts_errno));
@ -228,7 +232,7 @@ find_execute(PLAN *plan, char *paths[])
for (p = plan; p && (p->execute)(p, entry); p = p->next);
}
finish_execplus();
if (errno)
if (errno && (!ignore_readdir_race || errno != ENOENT))
err(1, "fts_read");
return (rval);
}

19
usr.bin/find/function.c
View File

@ -974,6 +974,25 @@ c_group(OPTION *option, char ***argvp)
return new;
}
/*
* -ignore_readdir_race functions --
*
* Always true. Ignore errors which occur if a file or a directory
* in a starting point gets deleted between reading the name and calling
* stat on it while find is traversing the starting point.
*/
PLAN *
c_ignore_readdir_race(OPTION *option, char ***argvp __unused)
{
if (strcmp(option->name, "-ignore_readdir_race") == 0)
ignore_readdir_race = 1;
else
ignore_readdir_race = 0;
return palloc(option);
}
/*
* -inum n functions --
*

1
usr.bin/find/main.c
View File

@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
time_t now; /* time find was run */
int dotfd; /* starting directory */
int ftsoptions; /* options for the ftsopen(3) call */
int ignore_readdir_race = 0; /* ignore readdir race */
int isdeprecated; /* using deprecated syntax */
int isdepth; /* do directories on post-order visit */
int isoutput; /* user specified output operator */

4
usr.bin/find/option.c
View File

@ -88,7 +88,7 @@ static OPTION const options[] = {
{ "-fstype", c_fstype, f_fstype, 0 },
{ "-gid", c_group, f_group, 0 },
{ "-group", c_group, f_group, 0 },
{ "-ignore_readdir_race",c_simple, f_always_true,0 },
{ "-ignore_readdir_race",c_ignore_readdir_race, f_always_true,0 },
{ "-ilname", c_name, f_name, F_LINK | F_IGNCASE },
{ "-iname", c_name, f_name, F_IGNCASE },
{ "-inum", c_inum, f_inum, 0 },
@ -127,7 +127,7 @@ static OPTION const options[] = {
{ "-newermm", c_newer, f_newer, 0 },
{ "-newermt", c_newer, f_newer, F_TIME2_T },
{ "-nogroup", c_nogroup, f_nogroup, 0 },
{ "-noignore_readdir_race",c_simple, f_always_true,0 },
{ "-noignore_readdir_race",c_ignore_readdir_race, f_always_true,0 },
{ "-noleaf", c_simple, f_always_true, 0 },
{ "-not", c_simple, f_not, 0 },
{ "-nouser", c_nouser, f_nouser, 0 },