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Avoid stat/fstat in statvfs/fstatvfs (BZ #15132)

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Delay the use of stat/fstat until stat data is required.  When the
kernel returns ST_VALID, stat data is not used by __internal_statvfs.
This commit is contained in:
Eric Wong
2014-05-29 09:41:29 +05:30
committed by Siddhesh Poyarekar
parent 0d3b7a190c
commit 26b0d2e1a1
7 changed files with 44 additions and 37 deletions
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4
sysdeps/unix/sysv/linux/fstatvfs.c
View File

@ -22,7 +22,7 @@
#include <sys/statvfs.h>
extern void __internal_statvfs (const char *name, struct statvfs *buf,
struct statfs *fsbuf, struct stat64 *st);
struct statfs *fsbuf, int fd);
int
@ -36,7 +36,7 @@ fstatvfs (int fd, struct statvfs *buf)
return -1;
/* Convert the result. */
__internal_statvfs (NULL, buf, &fsbuf, fstat64 (fd, &st) == -1 ? NULL : &st);
__internal_statvfs (NULL, buf, &fsbuf, fd);
/* We signal success if the statfs call succeeded. */
return 0;

10
sysdeps/unix/sysv/linux/fstatvfs64.c
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@ -25,7 +25,7 @@
extern void __internal_statvfs64 (const char *name, struct statvfs64 *buf,
struct statfs64 *fsbuf, struct stat64 *st);
struct statfs64 *fsbuf, int fd);
/* Return information about the filesystem on which FD resides. */
@ -60,12 +60,8 @@ __fstatvfs64 (int fd, struct statvfs64 *buf)
#endif
if (res == 0)
{
/* Convert the result. */
struct stat64 st;
__internal_statvfs64 (NULL, buf, &fsbuf,
fstat64 (fd, &st) == -1 ? NULL : &st);
}
/* Convert the result. */
__internal_statvfs64 (NULL, buf, &fsbuf, fd);
return res;
}

15
sysdeps/unix/sysv/linux/internal_statvfs.c
View File

@ -43,9 +43,11 @@
# ifndef __ASSUME_STATFS_F_FLAGS
int
__statvfs_getflags (const char *name, int fstype, struct stat64 *st)
__statvfs_getflags (const char *name, int fstype, int fd)
{
if (st == NULL)
struct stat64 st;
if ((fd < 0 ? stat64 (name, &st) : fstat64 (fd, &st)) < 0)
return 0;
const char *fsname = NULL;
@ -159,7 +161,7 @@ __statvfs_getflags (const char *name, int fstype, struct stat64 *st)
/* Find out about the device the current entry is for. */
struct stat64 fsst;
if (stat64 (mntbuf.mnt_dir, &fsst) >= 0
&& st->st_dev == fsst.st_dev)
&& st.st_dev == fsst.st_dev)
{
/* Bingo, we found the entry for the device FD is on.
Now interpret the option string. */
@ -222,14 +224,13 @@ __statvfs_getflags (const char *name, int fstype, struct stat64 *st)
}
# endif
#else
extern int __statvfs_getflags (const char *name, int fstype,
struct stat64 *st);
extern int __statvfs_getflags (const char *name, int fstype, int fd);
#endif
void
INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
struct STATFS *fsbuf, struct stat64 *st)
struct STATFS *fsbuf, int fd)
{
/* Now fill in the fields we have information for. */
buf->f_bsize = fsbuf->f_bsize;
@ -272,7 +273,7 @@ INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
the /etc/mtab file and search for the entry which matches the given
file. The way we can test for matching filesystem is using the
device number. */
buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, st);
buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, fd);
else
#endif
buf->f_flag = fsbuf->f_flags ^ ST_VALID;

6
sysdeps/unix/sysv/linux/statvfs.c
View File

@ -22,22 +22,20 @@
#include <sys/statvfs.h>
extern void __internal_statvfs (const char *name, struct statvfs *buf,
struct statfs *fsbuf, struct stat64 *st);
struct statfs *fsbuf, int fd);
int
statvfs (const char *file, struct statvfs *buf)
{
struct statfs fsbuf;
struct stat64 st;
/* Get as much information as possible from the system. */
if (__statfs (file, &fsbuf) < 0)
return -1;
/* Convert the result. */
__internal_statvfs (file, buf, &fsbuf,
stat64 (file, &st) == -1 ? NULL : &st);
__internal_statvfs (file, buf, &fsbuf, -1);
/* We signal success if the statfs call succeeded. */
return 0;

10
sysdeps/unix/sysv/linux/statvfs64.c
View File

@ -26,7 +26,7 @@
extern void __internal_statvfs64 (const char *name, struct statvfs64 *buf,
struct statfs64 *fsbuf, struct stat64 *st);
struct statfs64 *fsbuf, int fd);
/* Return information about the filesystem on which FILE resides. */
@ -61,12 +61,8 @@ __statvfs64 (const char *file, struct statvfs64 *buf)
#endif
if (res == 0)
{
/* Convert the result. */
struct stat64 st;
__internal_statvfs64 (file, buf, &fsbuf,
stat64 (file, &st) == -1 ? NULL : &st);
}
/* Convert the result. */
__internal_statvfs64 (file, buf, &fsbuf, -1);
return res;
}