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Truncate the xattr znode when updating existing attributes.

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If the attribute's new value was shorter than the old one the old
code would leave parts of the old value in the xattr znode.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #203
This commit is contained in:
Gunnar Beutner 2011-04-17 20:31:33 +02:00 committed by Brian Behlendorf
parent 274b7e79f3
commit bec30953cd
1 changed files with 7 additions and 1 deletions
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8
module/zfs/zpl_xattr.c
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@ -191,6 +191,7 @@ zpl_xattr_set(struct inode *ip, const char *name, const void *value,
cred_t *cr = CRED(); cred_t *cr = CRED();
ssize_t wrote; ssize_t wrote;
int error; int error;
const int xattr_mode = S_IFREG | 0644;
crhold(cr); crhold(cr);
@ -230,7 +231,7 @@ zpl_xattr_set(struct inode *ip, const char *name, const void *value,
/* Lookup failed create a new xattr. */ /* Lookup failed create a new xattr. */
if (xip == NULL) { if (xip == NULL) {
vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
vap->va_mode = S_IFREG | 0644; vap->va_mode = xattr_mode;
vap->va_mask = ATTR_MODE; vap->va_mask = ATTR_MODE;
vap->va_uid = crgetfsuid(cr); vap->va_uid = crgetfsuid(cr);
vap->va_gid = crgetfsgid(cr); vap->va_gid = crgetfsgid(cr);
@ -242,6 +243,11 @@ zpl_xattr_set(struct inode *ip, const char *name, const void *value,
} }
ASSERT(xip != NULL); ASSERT(xip != NULL);
error = -zfs_freesp(ITOZ(xip), 0, 0, xattr_mode, TRUE);
if (error)
goto out;
wrote = zpl_write_common(xip, value, size, 0, UIO_SYSSPACE, 0, cr); wrote = zpl_write_common(xip, value, size, 0, UIO_SYSSPACE, 0, cr);
if (wrote < 0) if (wrote < 0)
error = wrote; error = wrote;