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authorShehjar Tikoo <shehjart@gluster.com>2009-05-19 17:57:02 +0530
committerAnand V. Avati <avati@amp.gluster.com>2009-05-19 21:08:44 +0530
commitd71a5601fb2cf661d973a08a4cef9a15a9ec2363 (patch)
tree84b0f608a0b2e09d3409c8b462c03dcfdb428ac1 /booster
parent87b938d02b51a0b4c864fc5deba1a1f177a05a4c (diff)
booster: Fall back to remaining real_* functors
It is possible that some of the real_* functors for stat family of syscalls are NULL. I've seen this on libc. In that case, this commit attempts to use any available function that performs an equivalent operation. Signed-off-by: Anand V. Avati <avati@amp.gluster.com>
Diffstat (limited to 'booster')
-rw-r--r--booster/src/booster.c49
1 files changed, 36 insertions, 13 deletions
diff --git a/booster/src/booster.c b/booster/src/booster.c
index 8a78fb3..aeb4caa 100644
--- a/booster/src/booster.c
+++ b/booster/src/booster.c
@@ -1696,13 +1696,16 @@ booster_stat (const char *path, void *buf)
if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
goto out;
- if (real_stat == NULL) {
+ if (real_stat != NULL)
+ ret = real_stat (path, sbuf);
+ else if (real___xstat != NULL)
+ ret = real___xstat (0, path, sbuf);
+ else {
errno = ENOSYS;
ret = -1;
goto out;
}
- ret = real_stat (path, sbuf);
out:
return ret;
@@ -1718,13 +1721,16 @@ booster_stat64 (const char *path, void *buf)
if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
goto out;
- if (real_stat64 == NULL) {
+ if (real_stat64 != NULL)
+ ret = real_stat64 (path, sbuf);
+ else if (real___xstat64 != NULL)
+ ret = real___xstat64 (0, path, sbuf);
+ else {
errno = ENOSYS;
ret = -1;
goto out;
}
- ret = real_stat64 (path, sbuf);
out:
return ret;
}
@@ -1787,13 +1793,15 @@ booster_fstat (int fd, void *buf)
fh = booster_get_glfs_fd (booster_glfs_fdtable, fd);
if (!fh) {
- if (real_fstat == NULL) {
+ if (real_fstat != NULL)
+ ret = real_fstat (fd, sbuf);
+ else if (real___fxstat != NULL)
+ ret = real___fxstat (0, fd, sbuf);
+ else {
ret = -1;
errno = ENOSYS;
goto out;
}
-
- ret = real_fstat (fd, sbuf);
} else {
ret = glusterfs_fstat (fh, sbuf);
booster_put_glfs_fd (fh);
@@ -1812,12 +1820,21 @@ booster_fstat64 (int fd, void *buf)
fh = booster_get_glfs_fd (booster_glfs_fdtable, fd);
if (!fh) {
- if (real_fstat64 == NULL) {
+ if (real_fstat64 != NULL)
+ ret = real_fstat64 (fd, sbuf);
+ else if (real___fxstat64 != NULL)
+ /* Not sure how portable the use of 0 for
+ * version number is but it works over glibc.
+ * We need this because, I've
+ * observed that all the above real* functors can be
+ * NULL. In that case, this is our last and only option.
+ */
+ ret = real___fxstat64 (0, fd, sbuf);
+ else {
ret = -1;
errno = ENOSYS;
goto out;
}
- ret = real_fstat64 (fd, sbuf);
} else {
ret = glusterfs_fstat (fh, (struct stat *)sbuf);
booster_put_glfs_fd (fh);
@@ -1879,13 +1896,16 @@ booster_lstat (const char *path, void *buf)
if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
goto out;
- if (real_lstat == NULL) {
+ if (real_lstat != NULL)
+ ret = real_lstat (path, sbuf);
+ else if (real___lxstat != NULL)
+ ret = real___lxstat (0, path, sbuf);
+ else {
errno = ENOSYS;
ret = -1;
goto out;
}
- ret = real_lstat (path, sbuf);
out:
return ret;
@@ -1901,13 +1921,16 @@ booster_lstat64 (const char *path, void *buf)
if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
goto out;
- if (real_lstat64 == NULL) {
+ if (real_lstat64 != NULL)
+ ret = real_lstat64 (path, sbuf);
+ else if (real___lxstat64 != NULL)
+ ret = real___lxstat64 (0, path, sbuf);
+ else {
errno = ENOSYS;
ret = -1;
goto out;
}
- ret = real_lstat64 (path, sbuf);
out:
return ret;
}