zonefs: Simplify IO error handling
Simplify zonefs_check_zone_condition() by moving the code that changes an inode access rights to the new function zonefs_inode_update_mode(). Furthermore, since on mount an inode wpoffset is always zero when zonefs_check_zone_condition() is called during an inode initialization, the "mount" boolean argument is not necessary for the readonly zone case. This argument is thus removed. zonefs_io_error_cb() is also modified to use the inode offline and zone state flags instead of checking the device zone condition. The multiple calls to zonefs_check_zone_condition() are reduced to the first call on entry, which allows removing the "warn" argument. zonefs_inode_update_mode() is also used to update an inode access rights as zonefs_io_error_cb() modifies the inode flags depending on the volume error handling mode (defined with a mount option). Since an inode mode change differs for read-only zones between mount time and IO error time, the flag ZONEFS_ZONE_INIT_MODE is used to differentiate both cases. Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
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@ -155,48 +155,31 @@ void zonefs_update_stats(struct inode *inode, loff_t new_isize)
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* amount of readable data in the zone.
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*/
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static loff_t zonefs_check_zone_condition(struct inode *inode,
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struct blk_zone *zone, bool warn,
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bool mount)
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struct blk_zone *zone)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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switch (zone->cond) {
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case BLK_ZONE_COND_OFFLINE:
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/*
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* Dead zone: make the inode immutable, disable all accesses
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* and set the file size to 0 (zone wp set to zone start).
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*/
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if (warn)
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zonefs_warn(inode->i_sb, "inode %lu: offline zone\n",
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inode->i_ino);
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inode->i_flags |= S_IMMUTABLE;
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inode->i_mode &= ~0777;
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zone->wp = zone->start;
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zonefs_warn(inode->i_sb, "inode %lu: offline zone\n",
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inode->i_ino);
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zi->i_flags |= ZONEFS_ZONE_OFFLINE;
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return 0;
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case BLK_ZONE_COND_READONLY:
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/*
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* The write pointer of read-only zones is invalid. If such a
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* zone is found during mount, the file size cannot be retrieved
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* so we treat the zone as offline (mount == true case).
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* Otherwise, keep the file size as it was when last updated
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* so that the user can recover data. In both cases, writes are
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* always disabled for the zone.
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* The write pointer of read-only zones is invalid, so we cannot
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* determine the zone wpoffset (inode size). We thus keep the
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* zone wpoffset as is, which leads to an empty file
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* (wpoffset == 0) on mount. For a runtime error, this keeps
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* the inode size as it was when last updated so that the user
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* can recover data.
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*/
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if (warn)
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zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n",
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inode->i_ino);
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inode->i_flags |= S_IMMUTABLE;
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if (mount) {
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zone->cond = BLK_ZONE_COND_OFFLINE;
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inode->i_mode &= ~0777;
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zone->wp = zone->start;
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zi->i_flags |= ZONEFS_ZONE_OFFLINE;
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return 0;
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}
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zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n",
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inode->i_ino);
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zi->i_flags |= ZONEFS_ZONE_READONLY;
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inode->i_mode &= ~0222;
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return i_size_read(inode);
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if (zi->i_ztype == ZONEFS_ZTYPE_CNV)
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return zi->i_max_size;
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return zi->i_wpoffset;
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case BLK_ZONE_COND_FULL:
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/* The write pointer of full zones is invalid. */
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return zi->i_max_size;
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@ -207,6 +190,30 @@ static loff_t zonefs_check_zone_condition(struct inode *inode,
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}
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}
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/*
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* Check a zone condition and adjust its inode access permissions for
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* offline and readonly zones.
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*/
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static void zonefs_inode_update_mode(struct inode *inode)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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if (zi->i_flags & ZONEFS_ZONE_OFFLINE) {
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/* Offline zones cannot be read nor written */
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inode->i_flags |= S_IMMUTABLE;
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inode->i_mode &= ~0777;
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} else if (zi->i_flags & ZONEFS_ZONE_READONLY) {
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/* Readonly zones cannot be written */
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inode->i_flags |= S_IMMUTABLE;
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if (zi->i_flags & ZONEFS_ZONE_INIT_MODE)
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inode->i_mode &= ~0777;
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else
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inode->i_mode &= ~0222;
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}
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zi->i_flags &= ~ZONEFS_ZONE_INIT_MODE;
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}
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struct zonefs_ioerr_data {
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struct inode *inode;
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bool write;
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@ -228,10 +235,9 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
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* as there is no inconsistency between the inode size and the amount of
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* data writen in the zone (data_size).
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*/
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data_size = zonefs_check_zone_condition(inode, zone, true, false);
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data_size = zonefs_check_zone_condition(inode, zone);
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isize = i_size_read(inode);
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if (zone->cond != BLK_ZONE_COND_OFFLINE &&
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zone->cond != BLK_ZONE_COND_READONLY &&
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if (!(zi->i_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)) &&
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!err->write && isize == data_size)
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return 0;
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@ -264,24 +270,22 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
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* zone condition to read-only and offline respectively, as if the
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* condition was signaled by the hardware.
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*/
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if (zone->cond == BLK_ZONE_COND_OFFLINE ||
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sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL) {
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if ((zi->i_flags & ZONEFS_ZONE_OFFLINE) ||
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(sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL)) {
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zonefs_warn(sb, "inode %lu: read/write access disabled\n",
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inode->i_ino);
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if (zone->cond != BLK_ZONE_COND_OFFLINE) {
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zone->cond = BLK_ZONE_COND_OFFLINE;
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data_size = zonefs_check_zone_condition(inode, zone,
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false, false);
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}
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} else if (zone->cond == BLK_ZONE_COND_READONLY ||
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sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) {
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if (!(zi->i_flags & ZONEFS_ZONE_OFFLINE))
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zi->i_flags |= ZONEFS_ZONE_OFFLINE;
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zonefs_inode_update_mode(inode);
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data_size = 0;
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} else if ((zi->i_flags & ZONEFS_ZONE_READONLY) ||
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(sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO)) {
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zonefs_warn(sb, "inode %lu: write access disabled\n",
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inode->i_ino);
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if (zone->cond != BLK_ZONE_COND_READONLY) {
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zone->cond = BLK_ZONE_COND_READONLY;
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data_size = zonefs_check_zone_condition(inode, zone,
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false, false);
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}
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if (!(zi->i_flags & ZONEFS_ZONE_READONLY))
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zi->i_flags |= ZONEFS_ZONE_READONLY;
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zonefs_inode_update_mode(inode);
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data_size = isize;
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} else if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO &&
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data_size > isize) {
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/* Do not expose garbage data */
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@ -295,8 +299,7 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
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* close of the zone when the inode file is closed.
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*/
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if ((sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) &&
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(zone->cond == BLK_ZONE_COND_OFFLINE ||
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zone->cond == BLK_ZONE_COND_READONLY))
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(zi->i_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)))
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zi->i_flags &= ~ZONEFS_ZONE_OPEN;
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/*
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@ -378,6 +381,7 @@ static struct inode *zonefs_alloc_inode(struct super_block *sb)
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inode_init_once(&zi->i_vnode);
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mutex_init(&zi->i_truncate_mutex);
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zi->i_wpoffset = 0;
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zi->i_wr_refcnt = 0;
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zi->i_flags = 0;
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@ -594,7 +598,7 @@ static int zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
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zi->i_max_size = min_t(loff_t, MAX_LFS_FILESIZE,
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zone->capacity << SECTOR_SHIFT);
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zi->i_wpoffset = zonefs_check_zone_condition(inode, zone, true, true);
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zi->i_wpoffset = zonefs_check_zone_condition(inode, zone);
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inode->i_uid = sbi->s_uid;
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inode->i_gid = sbi->s_gid;
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@ -605,6 +609,10 @@ static int zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
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inode->i_fop = &zonefs_file_operations;
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inode->i_mapping->a_ops = &zonefs_file_aops;
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/* Update the inode access rights depending on the zone condition */
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zi->i_flags |= ZONEFS_ZONE_INIT_MODE;
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zonefs_inode_update_mode(inode);
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sb->s_maxbytes = max(zi->i_max_size, sb->s_maxbytes);
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sbi->s_blocks += zi->i_max_size >> sb->s_blocksize_bits;
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sbi->s_used_blocks += zi->i_wpoffset >> sb->s_blocksize_bits;
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@ -39,10 +39,11 @@ static inline enum zonefs_ztype zonefs_zone_type(struct blk_zone *zone)
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return ZONEFS_ZTYPE_SEQ;
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}
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#define ZONEFS_ZONE_OPEN (1U << 0)
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#define ZONEFS_ZONE_ACTIVE (1U << 1)
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#define ZONEFS_ZONE_OFFLINE (1U << 2)
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#define ZONEFS_ZONE_READONLY (1U << 3)
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#define ZONEFS_ZONE_INIT_MODE (1U << 0)
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#define ZONEFS_ZONE_OPEN (1U << 1)
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#define ZONEFS_ZONE_ACTIVE (1U << 2)
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#define ZONEFS_ZONE_OFFLINE (1U << 3)
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#define ZONEFS_ZONE_READONLY (1U << 4)
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/*
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* In-memory inode data.
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