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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-04-28 02:16:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:47 -0700
commit1ae43f826b6cb951fc5b0f9c92372a8d5b63c7f9 (patch)
treeaea00f01d74a40e026974182006e8af903b0b241 /fs/fat/inode.c
parente97e8de388723f9491514fa0434ddf1fd713a188 (diff)
fat: Add allow_utime option
Normally utime(2) checks current process is owner of the file, or it has CAP_FOWNER capability. But FAT filesystem doesn't have uid/gid as on disk info, so normal check is too unflexible. With this option you can relax it. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index f22f287e507..886f6095a37 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -785,6 +785,8 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_printf(m, ",gid=%u", opts->fs_gid);
seq_printf(m, ",fmask=%04o", opts->fs_fmask);
seq_printf(m, ",dmask=%04o", opts->fs_dmask);
+ if (opts->allow_utime)
+ seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
if (sbi->nls_disk)
seq_printf(m, ",codepage=%s", sbi->nls_disk->charset);
if (isvfat) {
@@ -840,9 +842,9 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
enum {
Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
- Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_usefree, Opt_nocase,
- Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable,
- Opt_dots, Opt_nodots,
+ Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage,
+ Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug,
+ Opt_immutable, Opt_dots, Opt_nodots,
Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
@@ -861,6 +863,7 @@ static match_table_t fat_tokens = {
{Opt_umask, "umask=%o"},
{Opt_dmask, "dmask=%o"},
{Opt_fmask, "fmask=%o"},
+ {Opt_allow_utime, "allow_utime=%o"},
{Opt_codepage, "codepage=%u"},
{Opt_usefree, "usefree"},
{Opt_nocase, "nocase"},
@@ -932,6 +935,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
opts->fs_uid = current->uid;
opts->fs_gid = current->gid;
opts->fs_fmask = opts->fs_dmask = current->fs->umask;
+ opts->allow_utime = -1;
opts->codepage = fat_default_codepage;
opts->iocharset = fat_default_iocharset;
if (is_vfat)
@@ -1019,6 +1023,11 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
return 0;
opts->fs_fmask = option;
break;
+ case Opt_allow_utime:
+ if (match_octal(&args[0], &option))
+ return 0;
+ opts->allow_utime = option & (S_IWGRP | S_IWOTH);
+ break;
case Opt_codepage:
if (match_int(&args[0], &option))
return 0;
@@ -1101,6 +1110,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
" for FAT filesystems, filesystem will be case sensitive!\n");
}
+ /* If user doesn't specify allow_utime, it's initialized from dmask. */
+ if (opts->allow_utime == (unsigned short)-1)
+ opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
if (opts->unicode_xlate)
opts->utf8 = 0;