Hi, Goffredo, I'm trying to do a new integration branch, and the patch inline in the text is corrupt (plus it has a massively verbose commit message):
Applying: Leaking file handle in scrub_fs_info() fatal: corrupt patch at line 74 Patch failed at 0001 Leaking file handle in scrub_fs_info() Normally, I'd use your git repo to get round the fact that every single patch you send by mail is whitespace-damaged, but: error: Unable to find 337bfb3250203a66b953ffcf7804418cb7c72052 under http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git Cannot obtain needed commit 337bfb3250203a66b953ffcf7804418cb7c72052 while processing commit ee3832b47a4b1d1dce8d1cacc802db32901b8c45. error: Fetch failed. Plus Jan had some suggested tweaks regarding whitespace -- could you re-roll the patch and maybe see what you can do to fix your git repo? (Or at least use git-send-email to send the patch so it doesn't get mangled). Thanks, Hugo. On Tue, Apr 24, 2012 at 08:43:23PM +0200, Goffredo Baroncelli wrote: > I was giving a look to the function scrub_fs_info( ), and to me it seems > that could be a potential file handle leaking problem. > > > In fact: > > static int scrub_fs_info(int fd, char *path, > struct btrfs_ioctl_fs_info_args *fi_args, > struct btrfs_ioctl_dev_info_args **di_ret) > { > > [...] > > ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args); > if (ret && errno == EINVAL) { > /* path is no mounted btrfs. try if it's a device */ > [...] > close(fd); <--- Here the > file handle is > closed > > fd = open_file_or_dir(mp); <--- then it is > re-opened > if (fd < 0) > return -errno; > } else if (ret) { > return -errno; > } > [...] > > But in the rest of the function: > a) the file handle is not closed > b) the (new) file handle isn't returned > > The function "scrub_fs_info()" is called from the functions > 1) cmd_scrub_status(), which doesn't use the file handle after the call > to the cmd_scrub_status() [except for a close()]. So no problem at all. > 2) scrub_start(), which uses the file handle after the call to the > cmd_scrub_status() functions. > > My suggestions is to change scrub_fs_info() to accept only the path. > Then it open (and closes) its own (and private) the file descriptor. > > Instead scrub_start(), opens a file descriptor after the call to the > scrub_fs_info() function. > > What do you think ? > > BR > G.Baroncelli > > You can pull the patch below from > > http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git > > branch > > fd-leaking > > ----- > > diff --git a/cmds-scrub.c b/cmds-scrub.c > index c4503f4..486768c 100644 > --- a/cmds-scrub.c > +++ b/cmds-scrub.c > @@ -979,19 +979,26 @@ static int scrub_device_info(int fd, u64 devid, > return ret ? -errno : 0; > } > > -static int scrub_fs_info(int fd, char *path, > +static int scrub_fs_info( char *path, > struct btrfs_ioctl_fs_info_args *fi_args, > struct btrfs_ioctl_dev_info_args **di_ret) > { > int ret = 0; > int ndevs = 0; > int i = 1; > + int fd; > struct btrfs_fs_devices *fs_devices_mnt = NULL; > struct btrfs_ioctl_dev_info_args *di_args; > char mp[BTRFS_PATH_NAME_MAX + 1]; > > memset(fi_args, 0, sizeof(*fi_args)); > > + fd = open_file_or_dir(path); > + if (fd < 0) { > + fprintf(stderr, "ERROR: can't access to '%s'\n", path); > + return -1; > + } > + > ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args); > if (ret && errno == EINVAL) { > /* path is no mounted btrfs. try if it's a device */ > @@ -1010,28 +1017,36 @@ static int scrub_fs_info(int fd, char *path, > if (fd < 0) > return -errno; > } else if (ret) { > + close(fd); > return -errno; > } > > - if (!fi_args->num_devices) > + if (!fi_args->num_devices){ > + close(fd); > return 0; > + } > > di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args)); > - if (!di_args) > + if (!di_args){ > + close(fd); > return -errno; > + } > > for (; i <= fi_args->max_id; ++i) { > BUG_ON(ndevs >= fi_args->num_devices); > ret = scrub_device_info(fd, i, &di_args[ndevs]); > if (ret == -ENODEV) > continue; > - if (ret) > + if (ret){ > + close(fd); > return ret; > + } > ++ndevs; > } > > BUG_ON(ndevs == 0); > > + close(fd); > return 0; > } > > @@ -1155,7 +1170,7 @@ static int scrub_start(int argc, char **argv, int > resume) > return 12; > } > > - ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args); > + ret = scrub_fs_info(path, &fi_args, &di_args); > if (ret) { > ERR(!do_quiet, "ERROR: getting dev info for scrub failed: " > "%s\n", strerror(-ret)); > @@ -1586,7 +1601,6 @@ static int cmd_scrub_status(int argc, char **argv) > .sun_family = AF_UNIX, > }; > int ret; > - int fdmnt; > int i; > int print_raw = 0; > int do_stats_per_dev = 0; > @@ -1615,13 +1629,7 @@ static int cmd_scrub_status(int argc, char **argv) > > path = argv[optind]; > > - fdmnt = open_file_or_dir(path); > - if (fdmnt < 0) { > - fprintf(stderr, "ERROR: can't access to '%s'\n", path); > - return 12; > - } > - > - ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args); > + ret = scrub_fs_info(path, &fi_args, &di_args); > if (ret) { > fprintf(stderr, "ERROR: getting dev info for scrub failed: " > "%s\n", strerror(-ret)); > @@ -1698,7 +1706,6 @@ static int cmd_scrub_status(int argc, char **argv) > out: > free_history(past_scrubs); > free(di_args); > - close(fdmnt); > if (fdres > -1) > close(fdres); > > > > > > -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Computer Science is not about computers, any more than --- astronomy is about telescopes.
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