ssize_t zpl_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) { znode_t *zp = ITOZ(dentry->d_inode); zfs_sb_t *zsb = ZTOZSB(zp); xattr_filldir_t xf = { buffer_size, 0, buffer, dentry->d_inode }; cred_t *cr = CRED(); fstrans_cookie_t cookie; int error = 0; crhold(cr); cookie = spl_fstrans_mark(); rrm_enter_read(&(zsb)->z_teardown_lock, FTAG); rw_enter(&zp->z_xattr_lock, RW_READER); if (zsb->z_use_sa && zp->z_is_sa) { error = zpl_xattr_list_sa(&xf); if (error) goto out; } error = zpl_xattr_list_dir(&xf, cr); if (error) goto out; error = xf.offset; out: rw_exit(&zp->z_xattr_lock); rrm_exit(&(zsb)->z_teardown_lock, FTAG); spl_fstrans_unmark(cookie); crfree(cr); return (error); }
void rrm_enter(rrmlock_t *rrl, krw_t rw, void *tag) { if (rw == RW_READER) rrm_enter_read(rrl, tag); else rrm_enter_write(rrl); }
static int zpl_xattr_set(struct inode *ip, const char *name, const void *value, size_t size, int flags) { znode_t *zp = ITOZ(ip); zfs_sb_t *zsb = ZTOZSB(zp); cred_t *cr = CRED(); fstrans_cookie_t cookie; int error; crhold(cr); cookie = spl_fstrans_mark(); rrm_enter_read(&(zsb)->z_teardown_lock, FTAG); rw_enter(&ITOZ(ip)->z_xattr_lock, RW_WRITER); /* * Before setting the xattr check to see if it already exists. * This is done to ensure the following optional flags are honored. * * XATTR_CREATE: fail if xattr already exists * XATTR_REPLACE: fail if xattr does not exist */ error = __zpl_xattr_get(ip, name, NULL, 0, cr); if (error < 0) { if (error != -ENODATA) goto out; if (flags & XATTR_REPLACE) goto out; /* The xattr to be removed already doesn't exist */ error = 0; if (value == NULL) goto out; } else { error = -EEXIST; if (flags & XATTR_CREATE) goto out; } /* Preferentially store the xattr as a SA for better performance */ if (zsb->z_use_sa && zsb->z_xattr_sa && zp->z_is_sa) { error = zpl_xattr_set_sa(ip, name, value, size, flags, cr); if (error == 0) goto out; } error = zpl_xattr_set_dir(ip, name, value, size, flags, cr); out: rw_exit(&ITOZ(ip)->z_xattr_lock); rrm_exit(&(zsb)->z_teardown_lock, FTAG); spl_fstrans_unmark(cookie); crfree(cr); ASSERT3S(error, <=, 0); return (error); }
static int zpl_xattr_get(struct inode *ip, const char *name, void *value, size_t size) { znode_t *zp = ITOZ(ip); zfs_sb_t *zsb = ZTOZSB(zp); cred_t *cr = CRED(); fstrans_cookie_t cookie; int error; crhold(cr); cookie = spl_fstrans_mark(); rrm_enter_read(&(zsb)->z_teardown_lock, FTAG); rw_enter(&zp->z_xattr_lock, RW_READER); error = __zpl_xattr_get(ip, name, value, size, cr); rw_exit(&zp->z_xattr_lock); rrm_exit(&(zsb)->z_teardown_lock, FTAG); spl_fstrans_unmark(cookie); crfree(cr); return (error); }
static int zpl_xattr_set(struct inode *ip, const char *name, const void *value, size_t size, int flags) { znode_t *zp = ITOZ(ip); zfs_sb_t *zsb = ZTOZSB(zp); cred_t *cr = CRED(); fstrans_cookie_t cookie; int where; int error; crhold(cr); cookie = spl_fstrans_mark(); rrm_enter_read(&(zsb)->z_teardown_lock, FTAG); rw_enter(&ITOZ(ip)->z_xattr_lock, RW_WRITER); /* * Before setting the xattr check to see if it already exists. * This is done to ensure the following optional flags are honored. * * XATTR_CREATE: fail if xattr already exists * XATTR_REPLACE: fail if xattr does not exist * * We also want to know if it resides in sa or dir, so we can make * sure we don't end up with duplicate in both places. */ error = __zpl_xattr_where(ip, name, &where, cr); if (error < 0) { if (error != -ENODATA) goto out; if (flags & XATTR_REPLACE) goto out; /* The xattr to be removed already doesn't exist */ error = 0; if (value == NULL) goto out; } else { error = -EEXIST; if (flags & XATTR_CREATE) goto out; } /* Preferentially store the xattr as a SA for better performance */ if (zsb->z_use_sa && zp->z_is_sa && (zsb->z_xattr_sa || (value == NULL && where & XATTR_IN_SA))) { error = zpl_xattr_set_sa(ip, name, value, size, flags, cr); if (error == 0) { /* * Successfully put into SA, we need to clear the one * in dir. */ if (where & XATTR_IN_DIR) zpl_xattr_set_dir(ip, name, NULL, 0, 0, cr); goto out; } } error = zpl_xattr_set_dir(ip, name, value, size, flags, cr); /* * Successfully put into dir, we need to clear the one in SA. */ if (error == 0 && (where & XATTR_IN_SA)) zpl_xattr_set_sa(ip, name, NULL, 0, 0, cr); out: rw_exit(&ITOZ(ip)->z_xattr_lock); rrm_exit(&(zsb)->z_teardown_lock, FTAG); spl_fstrans_unmark(cookie); crfree(cr); ASSERT3S(error, <=, 0); return (error); }