From 079b72bca30dbc74c86c7c7825b8c34eb86ce3ee Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Fri, 1 Nov 2013 13:06:57 -0400 Subject: btrfs: publish supported featured in sysfs This patch adds the ability to publish supported features to sysfs under /sys/fs/btrfs/features. The files are module-wide and export which features the kernel supports. The content, for now, is just "0\n". Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/sysfs.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 fs/btrfs/sysfs.h (limited to 'fs/btrfs/sysfs.h') diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h new file mode 100644 index 000000000000..863e031ed1c1 --- /dev/null +++ b/fs/btrfs/sysfs.h @@ -0,0 +1,43 @@ +#ifndef _BTRFS_SYSFS_H_ +#define _BTRFS_SYSFS_H_ + +enum btrfs_feature_set { + FEAT_COMPAT, + FEAT_COMPAT_RO, + FEAT_INCOMPAT, + FEAT_MAX +}; + +#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ +{ \ + .attr = { .name = __stringify(_name), .mode = _mode }, \ + .show = _show, \ + .store = _store, \ +} + +struct btrfs_feature_attr { + struct kobj_attribute kobj_attr; + enum btrfs_feature_set feature_set; + u64 feature_bit; +}; + +#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \ +static struct btrfs_feature_attr btrfs_attr_##_name = { \ + .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ + btrfs_feature_attr_show, NULL), \ + .feature_set = _feature_set, \ + .feature_bit = _prefix ##_## _feature_bit, \ +} +#define BTRFS_FEAT_ATTR_PTR(_name) (&btrfs_attr_##_name.kobj_attr.attr) + +#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ + BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) +#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ + BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature) +#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ + BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) + +/* convert from attribute */ +#define to_btrfs_feature_attr(a) \ + container_of(a, struct btrfs_feature_attr, kobj_attr) +#endif /* _BTRFS_SYSFS_H_ */ -- cgit v1.2.3 From 5ac1d209f11271fbfad0fa31ba56ec64c142d9ea Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Fri, 1 Nov 2013 13:06:58 -0400 Subject: btrfs: publish per-super attributes in sysfs This patch adds per-super attributes to sysfs. It doesn't publish any attributes yet, but does the proper lifetime handling as well as the basic infrastructure to add new attributes. Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 2 ++ fs/btrfs/disk-io.c | 9 +++++++++ fs/btrfs/sysfs.c | 36 ++++++++++++++++++++++++++++++++++++ fs/btrfs/sysfs.h | 10 ++++++++++ 4 files changed, 57 insertions(+) (limited to 'fs/btrfs/sysfs.h') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 498452ebfd37..c5c888fbf033 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3780,6 +3780,8 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, /* sysfs.c */ int btrfs_init_sysfs(void); void btrfs_exit_sysfs(void); +int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info); +void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info); /* xattr.c */ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 435ef132b800..81f3433fe4fd 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -48,6 +48,7 @@ #include "rcu-string.h" #include "dev-replace.h" #include "raid56.h" +#include "sysfs.h" #ifdef CONFIG_X86 #include @@ -2743,6 +2744,12 @@ retry_root_backup: btrfs_close_extra_devices(fs_info, fs_devices, 1); + ret = btrfs_sysfs_add_one(fs_info); + if (ret) { + pr_err("btrfs: failed to init sysfs interface: %d\n", ret); + goto fail_block_groups; + } + ret = btrfs_init_space_info(fs_info); if (ret) { printk(KERN_ERR "Failed to initial space info: %d\n", ret); @@ -3584,6 +3591,8 @@ int close_ctree(struct btrfs_root *root) percpu_counter_sum(&fs_info->delalloc_bytes)); } + btrfs_sysfs_remove_one(fs_info); + del_fs_roots(fs_info); btrfs_free_block_groups(fs_info); diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 9e217b581903..79be4a187af9 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -28,6 +28,25 @@ #include "transaction.h" #include "sysfs.h" +static void btrfs_release_super_kobj(struct kobject *kobj); +static struct kobj_type btrfs_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = btrfs_release_super_kobj, +}; + +static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) +{ + if (kobj->ktype != &btrfs_ktype) + return NULL; + return container_of(kobj, struct btrfs_fs_info, super_kobj); +} + +static void btrfs_release_super_kobj(struct kobject *kobj) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + complete(&fs_info->kobj_unregister); +} + static ssize_t btrfs_feature_attr_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) { @@ -65,6 +84,23 @@ static const struct attribute_group btrfs_feature_attr_group = { /* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; +void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) +{ + kobject_del(&fs_info->super_kobj); + kobject_put(&fs_info->super_kobj); + wait_for_completion(&fs_info->kobj_unregister); +} + +int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) +{ + int error; + + init_completion(&fs_info->kobj_unregister); + error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, + "%pU", fs_info->fsid); + return error; +} + int btrfs_init_sysfs(void) { int ret; diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h index 863e031ed1c1..d7c61bdf04ba 100644 --- a/fs/btrfs/sysfs.h +++ b/fs/btrfs/sysfs.h @@ -15,6 +15,13 @@ enum btrfs_feature_set { .store = _store, \ } +#define BTRFS_ATTR_RW(_name, _mode, _show, _store) \ +static struct kobj_attribute btrfs_attr_##_name = \ + __INIT_KOBJ_ATTR(_name, _mode, _show, _store) +#define BTRFS_ATTR(_name, _mode, _show) \ + BTRFS_ATTR_RW(_name, _mode, _show, NULL) +#define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr) + struct btrfs_feature_attr { struct kobj_attribute kobj_attr; enum btrfs_feature_set feature_set; @@ -40,4 +47,7 @@ static struct btrfs_feature_attr btrfs_attr_##_name = { \ /* convert from attribute */ #define to_btrfs_feature_attr(a) \ container_of(a, struct btrfs_feature_attr, kobj_attr) +#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr) +#define attr_to_btrfs_feature_attr(a) \ + to_btrfs_feature_attr(attr_to_btrfs_attr(a)) #endif /* _BTRFS_SYSFS_H_ */ -- cgit v1.2.3 From ba631941ef09c10e229661219dbd1707e56131d8 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Fri, 1 Nov 2013 13:07:01 -0400 Subject: btrfs: add ability to change features via sysfs This patch adds the ability to change (set/clear) features while the file system is mounted. A bitmask is added for each feature set for the support to set and clear the bits. A message indicating which bit has been set or cleared is issued when it's been changed and also when permission or support for a particular bit has been denied. Since the the attributes can now be writable, we need to introduce another struct attribute to hold the different permissions. If neither set or clear is supported, the file will have 0444 permissions. If either set or clear is supported, the file will have 0644 permissions and the store handler will filter out the write based on the bitmask. Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/sysfs.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++-- fs/btrfs/sysfs.h | 3 +- 2 files changed, 117 insertions(+), 4 deletions(-) (limited to 'fs/btrfs/sysfs.h') diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 4a2f23ee163f..7d340f352b77 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -43,21 +43,131 @@ static u64 get_features(struct btrfs_fs_info *fs_info, return btrfs_super_incompat_flags(disk_super); } +static void set_features(struct btrfs_fs_info *fs_info, + enum btrfs_feature_set set, u64 features) +{ + struct btrfs_super_block *disk_super = fs_info->super_copy; + if (set == FEAT_COMPAT) + btrfs_set_super_compat_flags(disk_super, features); + else if (set == FEAT_COMPAT_RO) + btrfs_set_super_compat_ro_flags(disk_super, features); + else + btrfs_set_super_incompat_flags(disk_super, features); +} + +static int can_modify_feature(struct btrfs_feature_attr *fa) +{ + int val = 0; + u64 set, clear; + switch (fa->feature_set) { + case FEAT_COMPAT: + set = BTRFS_FEATURE_COMPAT_SAFE_SET; + clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; + break; + case FEAT_COMPAT_RO: + set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; + clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; + break; + case FEAT_INCOMPAT: + set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; + clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; + break; + default: + BUG(); + } + + if (set & fa->feature_bit) + val |= 1; + if (clear & fa->feature_bit) + val |= 2; + + return val; +} + static ssize_t btrfs_feature_attr_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) { int val = 0; struct btrfs_fs_info *fs_info = to_fs_info(kobj); + struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); if (fs_info) { - struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); u64 features = get_features(fs_info, fa->feature_set); if (features & fa->feature_bit) val = 1; - } + } else + val = can_modify_feature(fa); return snprintf(buf, PAGE_SIZE, "%d\n", val); } +static ssize_t btrfs_feature_attr_store(struct kobject *kobj, + struct kobj_attribute *a, + const char *buf, size_t count) +{ + struct btrfs_fs_info *fs_info; + struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); + struct btrfs_trans_handle *trans; + u64 features, set, clear; + unsigned long val; + int ret; + + fs_info = to_fs_info(kobj); + if (!fs_info) + return -EPERM; + + ret = kstrtoul(skip_spaces(buf), 0, &val); + if (ret) + return ret; + + if (fa->feature_set == FEAT_COMPAT) { + set = BTRFS_FEATURE_COMPAT_SAFE_SET; + clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; + } else if (fa->feature_set == FEAT_COMPAT_RO) { + set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; + clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; + } else { + set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; + clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; + } + + features = get_features(fs_info, fa->feature_set); + + /* Nothing to do */ + if ((val && (features & fa->feature_bit)) || + (!val && !(features & fa->feature_bit))) + return count; + + if ((val && !(set & fa->feature_bit)) || + (!val && !(clear & fa->feature_bit))) { + btrfs_info(fs_info, + "%sabling feature %s on mounted fs is not supported.", + val ? "En" : "Dis", fa->kobj_attr.attr.name); + return -EPERM; + } + + btrfs_info(fs_info, "%s %s feature flag", + val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); + + trans = btrfs_start_transaction(fs_info->fs_root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + spin_lock(&fs_info->super_lock); + features = get_features(fs_info, fa->feature_set); + if (val) + features |= fa->feature_bit; + else + features &= ~fa->feature_bit; + set_features(fs_info, fa->feature_set, features); + spin_unlock(&fs_info->super_lock); + + ret = btrfs_commit_transaction(trans, fs_info->fs_root); + if (ret) + return ret; + + return count; +} + static umode_t btrfs_feature_visible(struct kobject *kobj, struct attribute *attr, int unused) { @@ -71,7 +181,9 @@ static umode_t btrfs_feature_visible(struct kobject *kobj, fa = attr_to_btrfs_feature_attr(attr); features = get_features(fs_info, fa->feature_set); - if (!(features & fa->feature_bit)) + if (can_modify_feature(fa)) + mode |= S_IWUSR; + else if (!(features & fa->feature_bit)) mode = 0; } diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h index d7c61bdf04ba..58c4b1f689d6 100644 --- a/fs/btrfs/sysfs.h +++ b/fs/btrfs/sysfs.h @@ -31,7 +31,8 @@ struct btrfs_feature_attr { #define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \ static struct btrfs_feature_attr btrfs_attr_##_name = { \ .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ - btrfs_feature_attr_show, NULL), \ + btrfs_feature_attr_show, \ + btrfs_feature_attr_store), \ .feature_set = _feature_set, \ .feature_bit = _prefix ##_## _feature_bit, \ } -- cgit v1.2.3 From 3b02a68a636400590dd6831a5fc046f0a7909a77 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Fri, 1 Nov 2013 13:07:02 -0400 Subject: btrfs: use feature attribute names to print better error messages Now that we have the feature name strings available in the kernel via the sysfs attributes, we can use them for printing better failure messages from the ioctl path. Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 35 ++++++++++++++++++++++++++++++----- fs/btrfs/sysfs.c | 33 ++++++++++++++++++++++++++++++++- fs/btrfs/sysfs.h | 2 ++ 3 files changed, 64 insertions(+), 6 deletions(-) (limited to 'fs/btrfs/sysfs.h') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index d4e105b54091..93b01fe6c731 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -56,6 +56,7 @@ #include "rcu-string.h" #include "send.h" #include "dev-replace.h" +#include "sysfs.h" static int btrfs_clone(struct inode *src, struct inode *inode, u64 off, u64 olen, u64 olen_aligned, u64 destoff); @@ -4516,17 +4517,27 @@ static int btrfs_ioctl_get_features(struct file *file, void __user *arg) return 0; } -static int check_feature_bits(struct btrfs_root *root, const char *type, +static int check_feature_bits(struct btrfs_root *root, + enum btrfs_feature_set set, u64 change_mask, u64 flags, u64 supported_flags, u64 safe_set, u64 safe_clear) { + const char *type = btrfs_feature_set_names[set]; + char *names; u64 disallowed, unsupported; u64 set_mask = flags & change_mask; u64 clear_mask = ~flags & change_mask; unsupported = set_mask & ~supported_flags; if (unsupported) { - btrfs_warn(root->fs_info, + names = btrfs_printable_features(set, unsupported); + if (names) { + btrfs_warn(root->fs_info, + "this kernel does not support the %s feature bit%s", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, "this kernel does not support %s bits 0x%llx", type, unsupported); return -EOPNOTSUPP; @@ -4534,7 +4545,14 @@ static int check_feature_bits(struct btrfs_root *root, const char *type, disallowed = set_mask & ~safe_set; if (disallowed) { - btrfs_warn(root->fs_info, + names = btrfs_printable_features(set, disallowed); + if (names) { + btrfs_warn(root->fs_info, + "can't set the %s feature bit%s while mounted", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, "can't set %s bits 0x%llx while mounted", type, disallowed); return -EPERM; @@ -4542,7 +4560,14 @@ static int check_feature_bits(struct btrfs_root *root, const char *type, disallowed = clear_mask & ~safe_clear; if (disallowed) { - btrfs_warn(root->fs_info, + names = btrfs_printable_features(set, disallowed); + if (names) { + btrfs_warn(root->fs_info, + "can't clear the %s feature bit%s while mounted", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, "can't clear %s bits 0x%llx while mounted", type, disallowed); return -EPERM; @@ -4552,7 +4577,7 @@ static int check_feature_bits(struct btrfs_root *root, const char *type, } #define check_feature(root, change_mask, flags, mask_base) \ -check_feature_bits(root, # mask_base, change_mask, flags, \ +check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ BTRFS_FEATURE_ ## mask_base ## _SUPP, \ BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 7d340f352b77..562e346994d9 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -254,6 +254,31 @@ const char * const btrfs_feature_set_names[3] = { static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; +char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) +{ + size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ + int len = 0; + int i; + char *str; + + str = kmalloc(bufsize, GFP_KERNEL); + if (!str) + return str; + + for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { + const char *name; + + if (!(flags & (1ULL << i))) + continue; + + name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; + len += snprintf(str + len, bufsize - len, "%s%s", + len ? "," : "", name); + } + + return str; +} + static void init_feature_attrs(void) { struct btrfs_feature_attr *fa; @@ -264,11 +289,17 @@ static void init_feature_attrs(void) BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != ARRAY_SIZE(btrfs_feature_attrs[0])); + memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); + memset(btrfs_unknown_feature_names, 0, + sizeof(btrfs_unknown_feature_names)); + for (i = 0; btrfs_supported_feature_attrs[i]; i++) { struct btrfs_feature_attr *sfa; struct attribute *a = btrfs_supported_feature_attrs[i]; + int bit; sfa = attr_to_btrfs_feature_attr(a); - fa = &btrfs_feature_attrs[sfa->feature_set][sfa->feature_bit]; + bit = ilog2(sfa->feature_bit); + fa = &btrfs_feature_attrs[sfa->feature_set][bit]; fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; } diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h index 58c4b1f689d6..c49fd25c911f 100644 --- a/fs/btrfs/sysfs.h +++ b/fs/btrfs/sysfs.h @@ -51,4 +51,6 @@ static struct btrfs_feature_attr btrfs_attr_##_name = { \ #define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr) #define attr_to_btrfs_feature_attr(a) \ to_btrfs_feature_attr(attr_to_btrfs_attr(a)) +char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags); +extern const char * const btrfs_feature_set_names[3]; #endif /* _BTRFS_SYSFS_H_ */ -- cgit v1.2.3 From 6ab0a2029ceaedb78af807871820708b7353e3be Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Fri, 1 Nov 2013 13:07:04 -0400 Subject: btrfs: publish allocation data in sysfs While trying to debug ENOSPC issues, it's helpful to understand what the kernel's view of the available space is. We export this information via ioctl, but sysfs files are more easily used. Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 5 ++ fs/btrfs/extent-tree.c | 82 +++++++++++++++++++++++++-- fs/btrfs/sysfs.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/sysfs.h | 8 +++ 4 files changed, 238 insertions(+), 5 deletions(-) (limited to 'fs/btrfs/sysfs.h') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index c5c888fbf033..f608306b5d88 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1151,6 +1151,9 @@ struct btrfs_space_info { spinlock_t lock; struct rw_semaphore groups_sem; wait_queue_head_t wait; + + struct kobject kobj; + struct kobject block_group_kobjs[BTRFS_NR_RAID_TYPES]; }; #define BTRFS_BLOCK_RSV_GLOBAL 1 @@ -1526,6 +1529,7 @@ struct btrfs_fs_info { int thread_pool_size; struct kobject super_kobj; + struct kobject *space_info_kobj; struct completion kobj_unregister; int do_barriers; int closing; @@ -3178,6 +3182,7 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group( struct btrfs_fs_info *info, u64 bytenr); void btrfs_put_block_group(struct btrfs_block_group_cache *cache); +int get_block_group_index(struct btrfs_block_group_cache *cache); struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, u32 blocksize, u64 parent, u64 root_objectid, diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index d15b4fc07554..e094d02ea76a 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -35,6 +35,7 @@ #include "locking.h" #include "free-space-cache.h" #include "math.h" +#include "sysfs.h" #undef SCRAMBLE_DELAYED_REFS @@ -3408,6 +3409,23 @@ int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) return readonly; } +static const char *alloc_name(u64 flags) +{ + switch (flags) { + case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: + return "mixed"; + case BTRFS_BLOCK_GROUP_METADATA: + return "metadata"; + case BTRFS_BLOCK_GROUP_DATA: + return "data"; + case BTRFS_BLOCK_GROUP_SYSTEM: + return "system"; + default: + WARN_ON(1); + return "invalid-combination"; + }; +} + static int update_space_info(struct btrfs_fs_info *info, u64 flags, u64 total_bytes, u64 bytes_used, struct btrfs_space_info **space_info) @@ -3463,11 +3481,21 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags, found->chunk_alloc = 0; found->flush = 0; init_waitqueue_head(&found->wait); + + ret = kobject_init_and_add(&found->kobj, &space_info_ktype, + info->space_info_kobj, "%s", + alloc_name(found->flags)); + if (ret) { + kfree(found); + return ret; + } + *space_info = found; list_add_rcu(&found->list, &info->space_info); if (flags & BTRFS_BLOCK_GROUP_DATA) info->data_sinfo = found; - return 0; + + return ret; } static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) @@ -6152,11 +6180,29 @@ int __get_raid_index(u64 flags) return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ } -static int get_block_group_index(struct btrfs_block_group_cache *cache) +int get_block_group_index(struct btrfs_block_group_cache *cache) { return __get_raid_index(cache->flags); } +static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { + [BTRFS_RAID_RAID10] = "raid10", + [BTRFS_RAID_RAID1] = "raid1", + [BTRFS_RAID_DUP] = "dup", + [BTRFS_RAID_RAID0] = "raid0", + [BTRFS_RAID_SINGLE] = "single", + [BTRFS_RAID_RAID5] = "raid5", + [BTRFS_RAID_RAID6] = "raid6", +}; + +const char *get_raid_name(enum btrfs_raid_types type) +{ + if (type >= BTRFS_NR_RAID_TYPES) + return NULL; + + return btrfs_raid_type_names[type]; +} + enum btrfs_loop_type { LOOP_CACHING_NOWAIT = 0, LOOP_CACHING_WAIT = 1, @@ -8340,6 +8386,8 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info) release_global_block_rsv(info); while (!list_empty(&info->space_info)) { + int i; + space_info = list_entry(info->space_info.next, struct btrfs_space_info, list); @@ -8350,9 +8398,17 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info) dump_space_info(space_info, 0, 0); } } - percpu_counter_destroy(&space_info->total_bytes_pinned); list_del(&space_info->list); - kfree(space_info); + for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { + struct kobject *kobj; + kobj = &space_info->block_group_kobjs[i]; + if (kobj->parent) { + kobject_del(kobj); + kobject_put(kobj); + } + } + kobject_del(&space_info->kobj); + kobject_put(&space_info->kobj); } return 0; } @@ -8363,6 +8419,19 @@ static void __link_block_group(struct btrfs_space_info *space_info, int index = get_block_group_index(cache); down_write(&space_info->groups_sem); + if (list_empty(&space_info->block_groups[index])) { + struct kobject *kobj = &space_info->block_group_kobjs[index]; + int ret; + + kobject_get(&space_info->kobj); /* put in release */ + ret = kobject_init_and_add(kobj, &btrfs_raid_ktype, + &space_info->kobj, + get_raid_name(index)); + if (ret) { + pr_warn("btrfs: failed to add kobject for block cache. ignoring.\n"); + kobject_put(&space_info->kobj); + } + } list_add_tail(&cache->list, &space_info->block_groups[index]); up_write(&space_info->groups_sem); } @@ -8803,8 +8872,11 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, * are still on the list after taking the semaphore */ list_del_init(&block_group->list); - if (list_empty(&block_group->space_info->block_groups[index])) + if (list_empty(&block_group->space_info->block_groups[index])) { + kobject_del(&block_group->space_info->block_group_kobjs[index]); + kobject_put(&block_group->space_info->block_group_kobjs[index]); clear_avail_alloc_bits(root->fs_info, block_group->flags); + } up_write(&block_group->space_info->groups_sem); if (block_group->cached == BTRFS_CACHE_STARTED) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 562e346994d9..e060958a6382 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -219,6 +219,140 @@ static const struct attribute_group btrfs_feature_attr_group = { .attrs = btrfs_supported_feature_attrs, }; +static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) +{ + u64 val; + if (lock) + spin_lock(lock); + val = *value_ptr; + if (lock) + spin_unlock(lock); + return snprintf(buf, PAGE_SIZE, "%llu\n", val); +} + +static ssize_t global_rsv_size_show(struct kobject *kobj, + struct kobj_attribute *ka, char *buf) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); + struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; + return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); +} +BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); + +static ssize_t global_rsv_reserved_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); + struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; + return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); +} +BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); + +#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) + +static ssize_t raid_bytes_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf); +BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); +BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); + +static ssize_t raid_bytes_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) + +{ + struct btrfs_space_info *sinfo = to_space_info(kobj->parent); + struct btrfs_block_group_cache *block_group; + int index = kobj - sinfo->block_group_kobjs; + u64 val = 0; + + down_read(&sinfo->groups_sem); + list_for_each_entry(block_group, &sinfo->block_groups[index], list) { + if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) + val += block_group->key.offset; + else + val += btrfs_block_group_used(&block_group->item); + } + up_read(&sinfo->groups_sem); + return snprintf(buf, PAGE_SIZE, "%llu\n", val); +} + +static struct attribute *raid_attributes[] = { + BTRFS_RAID_ATTR_PTR(total_bytes), + BTRFS_RAID_ATTR_PTR(used_bytes), + NULL +}; + +static void release_raid_kobj(struct kobject *kobj) +{ + kobject_put(kobj->parent); +} + +struct kobj_type btrfs_raid_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = release_raid_kobj, + .default_attrs = raid_attributes, +}; + +#define SPACE_INFO_ATTR(field) \ +static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ + struct kobj_attribute *a, \ + char *buf) \ +{ \ + struct btrfs_space_info *sinfo = to_space_info(kobj); \ + return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ +} \ +BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) + +static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + struct btrfs_space_info *sinfo = to_space_info(kobj); + s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); + return snprintf(buf, PAGE_SIZE, "%lld\n", val); +} + +SPACE_INFO_ATTR(flags); +SPACE_INFO_ATTR(total_bytes); +SPACE_INFO_ATTR(bytes_used); +SPACE_INFO_ATTR(bytes_pinned); +SPACE_INFO_ATTR(bytes_reserved); +SPACE_INFO_ATTR(bytes_may_use); +SPACE_INFO_ATTR(disk_used); +SPACE_INFO_ATTR(disk_total); +BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); + +static struct attribute *space_info_attrs[] = { + BTRFS_ATTR_PTR(flags), + BTRFS_ATTR_PTR(total_bytes), + BTRFS_ATTR_PTR(bytes_used), + BTRFS_ATTR_PTR(bytes_pinned), + BTRFS_ATTR_PTR(bytes_reserved), + BTRFS_ATTR_PTR(bytes_may_use), + BTRFS_ATTR_PTR(disk_used), + BTRFS_ATTR_PTR(disk_total), + BTRFS_ATTR_PTR(total_bytes_pinned), + NULL, +}; + +static void space_info_release(struct kobject *kobj) +{ + struct btrfs_space_info *sinfo = to_space_info(kobj); + percpu_counter_destroy(&sinfo->total_bytes_pinned); + kfree(sinfo); +} + +struct kobj_type space_info_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = space_info_release, + .default_attrs = space_info_attrs, +}; + +static const struct attribute *allocation_attrs[] = { + BTRFS_ATTR_PTR(global_rsv_reserved), + BTRFS_ATTR_PTR(global_rsv_size), + NULL, +}; + static void btrfs_release_super_kobj(struct kobject *kobj) { struct btrfs_fs_info *fs_info = to_fs_info(kobj); @@ -239,6 +373,9 @@ static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) { + sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); + kobject_del(fs_info->space_info_kobj); + kobject_put(fs_info->space_info_kobj); kobject_del(&fs_info->super_kobj); kobject_put(&fs_info->super_kobj); wait_for_completion(&fs_info->kobj_unregister); @@ -391,6 +528,17 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) if (error) goto failure; + fs_info->space_info_kobj = kobject_create_and_add("allocation", + &fs_info->super_kobj); + if (!fs_info->space_info_kobj) { + error = -ENOMEM; + goto failure; + } + + error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); + if (error) + goto failure; + return 0; failure: btrfs_sysfs_remove_one(fs_info); diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h index c49fd25c911f..f3cea3710d44 100644 --- a/fs/btrfs/sysfs.h +++ b/fs/btrfs/sysfs.h @@ -22,6 +22,12 @@ static struct kobj_attribute btrfs_attr_##_name = \ BTRFS_ATTR_RW(_name, _mode, _show, NULL) #define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr) +#define BTRFS_RAID_ATTR(_name, _show) \ +static struct kobj_attribute btrfs_raid_attr_##_name = \ + __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) +#define BTRFS_RAID_ATTR_PTR(_name) (&btrfs_raid_attr_##_name.attr) + + struct btrfs_feature_attr { struct kobj_attribute kobj_attr; enum btrfs_feature_set feature_set; @@ -53,4 +59,6 @@ static struct btrfs_feature_attr btrfs_attr_##_name = { \ to_btrfs_feature_attr(attr_to_btrfs_attr(a)) char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags); extern const char * const btrfs_feature_set_names[3]; +extern struct kobj_type space_info_ktype; +extern struct kobj_type btrfs_raid_ktype; #endif /* _BTRFS_SYSFS_H_ */ -- cgit v1.2.3