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inotify: Dynamically increase inotify max watches

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If we run out of inotify watches, try dynamically increasing the limit.
This commit is contained in:
Justin Maggard 2017-02-14 23:54:33 -08:00
parent 44f06f4557
commit 2301120dd0
1 changed files with 32 additions and 17 deletions
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49
inotify.c
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@ -82,6 +82,29 @@ get_path_from_wd(int wd)
return NULL;
}
static unsigned int
next_highest(unsigned int num)
{
num |= num >> 1;
num |= num >> 2;
num |= num >> 4;
num |= num >> 8;
num |= num >> 16;
return ++num;
}
static void
raise_watch_limit(unsigned int limit)
{
FILE *max_watches = fopen("/proc/sys/fs/inotify/max_user_watches", "r+");
if (!max_watches)
return;
if (!limit)
fscanf(max_watches, "%u", &limit);
fprintf(max_watches, "%u", next_highest(limit));
fclose(max_watches);
}
static int
add_watch(int fd, const char * path)
{
@ -89,6 +112,11 @@ add_watch(int fd, const char * path)
int wd;
wd = inotify_add_watch(fd, path, IN_CREATE|IN_CLOSE_WRITE|IN_DELETE|IN_MOVE);
if( wd < 0 && errno == ENOSPC)
{
raise_watch_limit(0);
wd = inotify_add_watch(fd, path, IN_CREATE|IN_CLOSE_WRITE|IN_DELETE|IN_MOVE);
}
if( wd < 0 )
{
DPRINTF(E_ERROR, L_INOTIFY, "inotify_add_watch(%s) [%s]\n", path, strerror(errno));
@ -133,17 +161,6 @@ remove_watch(int fd, const char * path)
return 1;
}
static unsigned int
next_highest(unsigned int num)
{
num |= num >> 1;
num |= num >> 2;
num |= num >> 4;
num |= num >> 8;
num |= num >> 16;
return(++num);
}
static int
inotify_create_watches(int fd)
{
@ -176,22 +193,20 @@ inotify_create_watches(int fd)
fclose(max_watches);
if( (watch_limit < DESIRED_WATCH_LIMIT) || (watch_limit < (num_watches*4/3)) )
{
max_watches = fopen("/proc/sys/fs/inotify/max_user_watches", "w");
if( max_watches )
if (access("/proc/sys/fs/inotify/max_user_watches", W_OK) == 0)
{
if( DESIRED_WATCH_LIMIT >= (num_watches*3/4) )
{
fprintf(max_watches, "%u", DESIRED_WATCH_LIMIT);
raise_watch_limit(8191U);
}
else if( next_highest(num_watches) >= (num_watches*3/4) )
{
fprintf(max_watches, "%u", next_highest(num_watches));
raise_watch_limit(num_watches);
}
else
{
fprintf(max_watches, "%u", next_highest(next_highest(num_watches)));
raise_watch_limit(next_highest(num_watches));
}
fclose(max_watches);
}
else
{